insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (195,17,'CURRENT_USER','Syntax\n------\n\nCURRENT_USER, CURRENT_USER()\n\nDescription\n-----------\n\nReturns the user name and host name combination for the MariaDB account that\nthe server used to authenticate the current client. This account determines\nyour access privileges. The return value is a string in the utf8 character set.\n\nThe value of CURRENT_USER() can differ from the value of USER().\nCURRENT_ROLE() returns the current active role.\n\nExamples\n--------\n\nshell> mysql --user=\"anonymous\"\n\nselect user(),current_user();\n+---------------------+----------------+\n| user()              | current_user() |\n+---------------------+----------------+\n| anonymous@localhost | @localhost     |\n+---------------------+----------------+\n\nWhen calling CURRENT_USER() in a stored procedure, it returns the owner of the\nstored procedure, as defined with DEFINER.\n\nURL: https://mariadb.com/kb/en/current_user/','','https://mariadb.com/kb/en/current_user/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (196,17,'DATABASE','Syntax\n------\n\nDATABASE()\n\nDescription\n-----------\n\nReturns the default (current) database name as a string in the utf8 character\nset. If there is no default database, DATABASE() returns NULL. Within a stored\nroutine, the default database is the database that the routine is associated\nwith, which is not necessarily the same as the database that is the default in\nthe calling context.\n\nSCHEMA() is a synonym for DATABASE().\n\nTo select a default database, the USE statement can be run. Another way to set\nthe default database is specifying its name at mysql command line client\nstartup.\n\nExamples\n--------\n\nSELECT DATABASE();\n+------------+\n| DATABASE() |\n+------------+\n| NULL       |\n+------------+\n\nUSE test;\nDatabase changed\n\nSELECT DATABASE();\n+------------+\n| DATABASE() |\n+------------+\n| test       |\n+------------+\n\nURL: https://mariadb.com/kb/en/database/','','https://mariadb.com/kb/en/database/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (197,17,'DECODE_HISTOGRAM','Syntax\n------\n\nDECODE_HISTOGRAM(hist_type,histogram)\n\nDescription\n-----------\n\nReturns a string of comma separated numeric values corresponding to a\nprobability distribution represented by the histogram of type hist_type\n(SINGLE_PREC_HB or DOUBLE_PREC_HB). The hist_type and histogram would be\ncommonly used from the mysql.column_stats table.\n\nSee Histogram Based Statistics for details.\n\nExamples\n--------\n\nCREATE TABLE origin (\n i INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,\n v INT UNSIGNED NOT NULL\n);\n\nINSERT INTO origin(v) VALUES \n (1),(2),(3),(4),(5),(10),(20),\n (30),(40),(50),(60),(70),(80),\n (90),(100),(200),(400),(800);\n\nSET histogram_size=10,histogram_type=SINGLE_PREC_HB;\n\nANALYZE TABLE origin PERSISTENT FOR ALL;\n+-------------+---------+----------+-----------------------------------------+\n| Table       | Op      | Msg_type | Msg_text                                |\n+-------------+---------+----------+-----------------------------------------+\n| test.origin | analyze | status   | Engine-independent statistics collected |\n| test.origin | analyze | status   | OK                                      |\n+-------------+---------+----------+-----------------------------------------+\n\nSELECT db_name,table_name,column_name,hist_type,\n hex(histogram),decode_histogram(hist_type,histogram)\n FROM mysql.column_stats WHERE db_name=\'test\' and table_name=\'origin\';\n+---------+------------+-------------+----------------+----------------------+-\n-----------------------------------------------------------------+\n| db_name | table_name | column_name | hist_type      | hex(histogram)       |\ndecode_histogram(hist_type,histogram)                             |\n+---------+------------+-------------+----------------+----------------------+-\n-----------------------------------------------------------------+\n| test    | origin     | i           | SINGLE_PREC_HB | 0F2D3C5A7887A5C3D2F0 |\n0.059,0.118,0.059,0.118,0.118,0.059,0.118,0.118,0.059,0.118,0.059 |\n| test    | origin     | v           | SINGLE_PREC_HB | 000001060C0F161C1F7F |\n0.000,0.000,0.004,0.020,0.024,0.012,0.027,0.024,0.012,0.376,0.502 |\n+---------+------------+-------------+----------------+----------------------+-\n-----------------------------------------------------------------+\n\nSET histogram_size=20,histogram_type=DOUBLE_PREC_HB;\n\nANALYZE TABLE origin PERSISTENT FOR ALL;\n+-------------+---------+----------+-----------------------------------------+\n| Table       | Op      | Msg_type | Msg_text                                |\n+-------------+---------+----------+-----------------------------------------+\n| test.origin | analyze | status   | Engine-independent statistics collected |\n| test.origin | analyze | status   | OK                                      |\n+-------------+---------+----------+-----------------------------------------+\n\nSELECT db_name,table_name,column_name,\n hist_type,hex(histogram),decode_histogram(hist_type,histogram)\n FROM mysql.column_stats WHERE db_name=\'test\' and table_name=\'origin\';\n+---------+------------+-------------+----------------+------------------------\n-----------------+-------------------------------------------------------------\n---------------------------+\n| db_name | table_name | column_name | hist_type      | hex(histogram)        \n         | decode_histogram(hist_type,histogram)\n              |\n+---------+------------+-------------+----------------+------------------------\n-----------------+-------------------------------------------------------------\n---------------------------+\n| test    | origin     | i           | DOUBLE_PREC_HB |\n0F0F2D2D3C3C5A5A78788787A5A5C3C3D2D2F0F0 |\n0.05882,0.11765,0.05882,0.11765,0.11765,0.05882,0.11765,0.11765,0.05882,0.11765\n0.05882 |\n| test    | origin     | v           | DOUBLE_PREC_HB |\n5200F600480116067E0CB30F1B16831CB81FD67F |\n0.00125,0.00250,0.00125,0.01877,0.02502,0.01253,0.02502,0.02502,0.01253,0.37546\n0.50063 |\n\nURL: https://mariadb.com/kb/en/decode_histogram/','','https://mariadb.com/kb/en/decode_histogram/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (198,17,'DEFAULT','Syntax\n------\n\nDEFAULT(col_name)\n\nDescription\n-----------\n\nReturns the default value for a table column. If the column has no default\nvalue (and is not NULLABLE - NULLABLE fields have a NULL default), an error is\nreturned.\n\nFor integer columns using AUTO_INCREMENT, 0 is returned.\n\nWhen using DEFAULT as a value to set in an INSERT or UPDATE statement, you can\nuse the bare keyword DEFAULT without the parentheses and argument to refer to\nthe column in context. You can only use DEFAULT as a bare keyword if you are\nusing it alone without a surrounding expression or function.\n\nExamples\n--------\n\nSelect only non-default values for a column:\n\nSELECT i FROM t WHERE i != DEFAULT(i);\n\nUpdate values to be one greater than the default value:\n\nUPDATE t SET i = DEFAULT(i)+1 WHERE i < 100;\n\nWhen referring to the default value exactly in UPDATE or INSERT, you can omit\nthe argument:\n\nINSERT INTO t (i) VALUES (DEFAULT);\nUPDATE t SET i = DEFAULT WHERE i < 100;\n\nCREATE OR REPLACE TABLE t (\n i INT NOT NULL AUTO_INCREMENT,\n j INT NOT NULL,\n k INT DEFAULT 3,\n l INT NOT NULL DEFAULT 4,\n m INT,\n PRIMARY KEY (i)\n);\n\nDESC t;\n+-------+---------+------+-----+---------+----------------+\n| Field | Type    | Null | Key | Default | Extra          |\n+-------+---------+------+-----+---------+----------------+\n| i     | int(11) | NO   | PRI | NULL    | auto_increment |\n| j     | int(11) | NO   |     | NULL    |                |\n| k     | int(11) | YES  |     | 3       |                |\n| l     | int(11) | NO   |     | 4       |                |\n| m     | int(11) | YES  |     | NULL    |                |\n+-------+---------+------+-----+---------+----------------+\n\nINSERT INTO t (j) VALUES (1);\nINSERT INTO t (j,m) VALUES (2,2);\nINSERT INTO t (j,l,m) VALUES (3,3,3);\n\nSELECT * FROM t;\n+---+---+------+---+------+\n| i | j | k    | l | m    |\n+---+---+------+---+------+\n| 1 | 1 |    3 | 4 | NULL |\n| 2 | 2 |    3 | 4 |    2 |\n| 3 | 3 |    3 | 3 |    3 |\n+---+---+------+---+------+\n\nSELECT DEFAULT(i), DEFAULT(k), DEFAULT (l), DEFAULT(m) FROM t;\n+------------+------------+-------------+------------+\n| DEFAULT(i) | DEFAULT(k) | DEFAULT (l) | DEFAULT(m) |\n+------------+------------+-------------+------------+\n|          0 |          3 |           4 |       NULL |\n|          0 |          3 |           4 |       NULL |\n|          0 |          3 |           4 |       NULL |\n+------------+------------+-------------+------------+\n\nSELECT DEFAULT(i), DEFAULT(k), DEFAULT (l), DEFAULT(m), DEFAULT(j)  FROM t;\nERROR 1364 (HY000): Field \'j\' doesn\'t have a default value\n\nSELECT * FROM t WHERE i = DEFAULT(i);\nEmpty set (0.001 sec)\n\nSELECT * FROM t WHERE j = DEFAULT(j);\nERROR 1364 (HY000): Field \'j\' doesn\'t have a default value\n\nSELECT * FROM t WHERE k = DEFAULT(k);\n+---+---+------+---+------+\n| i | j | k    | l | m    |\n+---+---+------+---+------+\n| 1 | 1 |    3 | 4 | NULL |\n| 2 | 2 |    3 | 4 |    2 |\n| 3 | 3 |    3 | 3 |    3 |\n+---+---+------+---+------+\n\nSELECT * FROM t WHERE l = DEFAULT(l);\n+---+---+------+---+------+\n| i | j | k    | l | m    |\n+---+---+------+---+------+\n| 1 | 1 |    3 | 4 | NULL |\n| 2 | 2 |    3 | 4 |    2 |\n+---+---+------+---+------+\n\nSELECT * FROM t WHERE m = DEFAULT(m);\nEmpty set (0.001 sec)\n\nSELECT * FROM t WHERE m <=> DEFAULT(m);\n+---+---+------+---+------+\n| i | j | k    | l | m    |\n+---+---+------+---+------+\n| 1 | 1 |    3 | 4 | NULL |\n+---+---+------+---+------+\n\nURL: https://mariadb.com/kb/en/default/','','https://mariadb.com/kb/en/default/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (199,17,'FOUND_ROWS','Syntax\n------\n\nFOUND_ROWS()\n\nDescription\n-----------\n\nA SELECT statement may include a LIMIT clause to restrict the number of rows\nthe server returns to the client. In some cases, it is desirable to know how\nmany rows the statement would have returned without the LIMIT, but without\nrunning the statement again. To obtain this row count, include a\nSQL_CALC_FOUND_ROWS option in the SELECT statement, and then invoke\nFOUND_ROWS() afterwards.\n\nYou can also use FOUND_ROWS() to obtain the number of rows returned by a\nSELECT which does not contain a LIMIT clause. In this case you don\'t need to\nuse the SQL_CALC_FOUND_ROWS option. This can be useful for example in a stored\nprocedure.\n\nAlso, this function works with some other statements which return a resultset,\nincluding SHOW, DESC and HELP. For DELETE ... RETURNING you should use\nROW_COUNT(). It also works as a prepared statement, or after executing a\nprepared statement.\n\nStatements which don\'t return any results don\'t affect FOUND_ROWS() - the\nprevious value will still be returned.\n\nWarning: When used after a CALL statement, this function returns the number of\nrows selected by the last query in the procedure, not by the whole procedure.\n\nStatements using the FOUND_ROWS() function are not safe for replication.\n\nExamples\n--------\n\nSHOW ENGINES\\G\n*************************** 1. row ***************************\n   Engine: CSV\n  Support: YES\n  Comment: Stores tables as CSV files\nTransactions: NO\n     XA: NO\n Savepoints: NO\n*************************** 2. row ***************************\n   Engine: MRG_MyISAM\n  Support: YES\n  Comment: Collection of identical MyISAM tables\nTransactions: NO\n     XA: NO\n Savepoints: NO\n\n...\n\n*************************** 8. row ***************************\n   Engine: PERFORMANCE_SCHEMA\n  Support: YES\n  Comment: Performance Schema\nTransactions: NO\n     XA: NO\n Savepoints: NO\n8 rows in set (0.000 sec)\n\nSELECT FOUND_ROWS();\n+--------------+\n| FOUND_ROWS() |\n+--------------+\n|           8 |\n+--------------+\n\nSELECT SQL_CALC_FOUND_ROWS * FROM tbl_name WHERE id > 100 LIMIT 10;\n\nSELECT FOUND_ROWS();\n+--------------+\n| FOUND_ROWS() |\n+--------------+\n|           23 |\n+--------------+\n\nURL: https://mariadb.com/kb/en/found_rows/','','https://mariadb.com/kb/en/found_rows/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (200,17,'LAST_INSERT_ID','Syntax\n------\n\nLAST_INSERT_ID(), LAST_INSERT_ID(expr)\n\nDescription\n-----------\n\nLAST_INSERT_ID() (no arguments) returns the first automatically generated\nvalue successfully inserted for an AUTO_INCREMENT column as a result of the\nmost recently executed INSERT statement. The value of LAST_INSERT_ID() remains\nunchanged if no rows are successfully inserted.\n\nIf one gives an argument to LAST_INSERT_ID(), then it will return the value of\nthe expression and the next call to LAST_INSERT_ID() will return the same\nvalue. The value will also be sent to the client and can be accessed by the\nmysql_insert_id function.\n\nFor example, after inserting a row that generates an AUTO_INCREMENT value, you\ncan get the value like this:\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|                9 |\n+------------------+\n\nYou can also use LAST_INSERT_ID() to delete the last inserted row:\n\nDELETE FROM product WHERE id = LAST_INSERT_ID();\n\nIf no rows were successfully inserted, LAST_INSERT_ID() returns 0.\n\nThe value of LAST_INSERT_ID() will be consistent across all versions if all\nrows in the INSERT or UPDATE statement were successful.\n\nThe currently executing statement does not affect the value of\nLAST_INSERT_ID(). Suppose that you generate an AUTO_INCREMENT value with one\nstatement, and then refer to LAST_INSERT_ID() in a multiple-row INSERT\nstatement that inserts rows into a table with its own AUTO_INCREMENT column.\nThe value of LAST_INSERT_ID() will remain stable in the second statement; its\nvalue for the second and later rows is not affected by the earlier row\ninsertions. (However, if you mix references to LAST_INSERT_ID() and\nLAST_INSERT_ID(expr), the effect is undefined.)\n\nIf the previous statement returned an error, the value of LAST_INSERT_ID() is\nundefined. For transactional tables, if the statement is rolled back due to an\nerror, the value of LAST_INSERT_ID() is left undefined. For manual ROLLBACK,\nthe value of LAST_INSERT_ID() is not restored to that before the transaction;\nit remains as it was at the point of the ROLLBACK.\n\nWithin the body of a stored routine (procedure or function) or a trigger, the\nvalue of LAST_INSERT_ID() changes the same way as for statements executed\noutside the body of these kinds of objects. The effect of a stored routine or\ntrigger upon the value of LAST_INSERT_ID() that is seen by following\nstatements depends on the kind of routine:\n\n* If a stored procedure executes statements that change the value of\nLAST_INSERT_ID(), the new value will be seen by statements that follow the\nprocedure call.\n\n* For stored functions and triggers that change the value, the value is\nrestored when the function or trigger ends, so following statements will not\nsee a changed value.\n\nExamples\n--------\n\nCREATE TABLE t (\n id INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY,\n f VARCHAR(1))\nENGINE = InnoDB;\n\nINSERT INTO t(f) VALUES(\'a\');\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|                1 |\n+------------------+\n\nINSERT INTO t(f) VALUES(\'b\');\n\nINSERT INTO t(f) VALUES(\'c\');\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|                3 |\n+------------------+\n\nINSERT INTO t(f) VALUES(\'d\'),(\'e\');\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|                4 |\n+------------------+\n\nSELECT * FROM t;\n+----+------+\n| id | f    |\n+----+------+\n|  1 | a    |\n|  2 | b    |\n|  3 | c    |\n|  4 | d    |\n|  5 | e    |\n+----+------+\n\nSELECT LAST_INSERT_ID(12);\n+--------------------+\n| LAST_INSERT_ID(12) |\n+--------------------+\n|                 12 |\n+--------------------+\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|               12 |\n+------------------+\n\nINSERT INTO t(f) VALUES(\'f\');\n\nSELECT LAST_INSERT_ID();\n+------------------+\n| LAST_INSERT_ID() |\n+------------------+\n|                6 |\n+------------------+\n\nSELECT * FROM t;\n+----+------+\n| id | f    |\n+----+------+\n|  1 | a    |\n|  2 | b    |\n|  3 | c    |\n|  4 | d    |\n|  5 | e    |\n|  6 | f    |\n+----+------+\n\nSELECT LAST_INSERT_ID(12);\n+--------------------+\n| LAST_INSERT_ID(12) |\n+--------------------+\n|                 12 |\n+--------------------+\n\nINSERT INTO t(f) VALUES(\'g\');\n\nSELECT * FROM t;\n+----+------+\n| id | f    |\n+----+------+\n|  1 | a    |\n|  2 | b    |\n|  3 | c    |\n|  4 | d    |\n|  5 | e    |\n|  6 | f    |\n|  7 | g    |\n+----+------+\n\nURL: https://mariadb.com/kb/en/last_insert_id/','','https://mariadb.com/kb/en/last_insert_id/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (201,17,'LAST_VALUE','Syntax\n------\n\nLAST_VALUE(expr,[expr,...])\n\nLAST_VALUE(expr) OVER (\n [ PARTITION BY partition_expression ]\n [ ORDER BY order_list ]\n)\n\nDescription\n-----------\n\nLAST_VALUE() evaluates all expressions and returns the last.\n\nThis is useful together with setting user variables to a value with\n@var:=expr, for example when you want to get data of rows updated/deleted\nwithout having to do two queries against the table.\n\nLAST_VALUE can be used as a window function.\n\nReturns NULL if no last value exists.\n\nExamples\n--------\n\nCREATE TABLE t1 (a int, b int);\nINSERT INTO t1 VALUES(1,10),(2,20);\nDELETE FROM t1 WHERE a=1 AND last_value(@a:=a,@b:=b,1);\nSELECT @a,@b;\n+------+------+\n| @a   | @b   |\n+------+------+\n|    1 |   10 |\n+------+------+\n\nAs a window function:\n\nCREATE TABLE t1 (\n pk int primary key,\n a int,\n b int,\n c char(10),\n d decimal(10, 3),\n e real\n);\n\nINSERT INTO t1 VALUES\n( 1, 0, 1,    \'one\',    0.1,  0.001),\n( 2, 0, 2,    \'two\',    0.2,  0.002),\n( 3, 0, 3,    \'three\',  0.3,  0.003),\n( 4, 1, 2,    \'three\',  0.4,  0.004),\n( 5, 1, 1,    \'two\',    0.5,  0.005),\n( 6, 1, 1,    \'one\',    0.6,  0.006),\n( 7, 2, NULL, \'n_one\',  0.5,  0.007),\n( 8, 2, 1,    \'n_two\',  NULL, 0.008),\n( 9, 2, 2,    NULL,     0.7,  0.009),\n(10, 2, 0,    \'n_four\', 0.8,  0.010),\n(11, 2, 10,   NULL,     0.9,  NULL);\n\nSELECT pk, FIRST_VALUE(pk) OVER (ORDER BY pk) AS first_asc,\n     LAST_VALUE(pk) OVER (ORDER BY pk) AS last_asc,\n     FIRST_VALUE(pk) OVER (ORDER BY pk DESC) AS first_desc,\n     LAST_VALUE(pk) OVER (ORDER BY pk DESC) AS last_desc\nFROM t1\nORDER BY pk DESC;\n\n+----+-----------+----------+------------+-----------+\n| pk | first_asc | last_asc | first_desc | last_desc |\n+----+-----------+----------+------------+-----------+\n| 11 |         1 |       11 |         11 |        11 |\n| 10 |         1 |       10 |         11 |        10 |\n|  9 |         1 |        9 |         11 |         9 |\n|  8 |         1 |        8 |         11 |         8 |\n|  7 |         1 |        7 |         11 |         7 |\n|  6 |         1 |        6 |         11 |         6 |\n|  5 |         1 |        5 |         11 |         5 |\n|  4 |         1 |        4 |         11 |         4 |\n|  3 |         1 |        3 |         11 |         3 |\n|  2 |         1 |        2 |         11 |         2 |\n|  1 |         1 |        1 |         11 |         1 |\n+----+-----------+----------+------------+-----------+\n\nCREATE OR REPLACE TABLE t1 (i int);\nINSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);\n\nSELECT i,\n FIRST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN CURRENT ROW and 1 FOLLOWING) AS\nf_1f,\n LAST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN CURRENT ROW and 1 FOLLOWING) AS\nl_1f,\n FIRST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS\nf_1p1f,\n LAST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS\nf_1p1f,\n FIRST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 2 PRECEDING AND 1 PRECEDING) AS\nf_2p1p,\n LAST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 2 PRECEDING AND 1 PRECEDING) AS\nf_2p1p,\n FIRST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 1 FOLLOWING AND 2 FOLLOWING) AS\nf_1f2f,\n LAST_VALUE(i) OVER (ORDER BY i ROWS BETWEEN 1 FOLLOWING AND 2 FOLLOWING) AS\nf_1f2f\nFROM t1;\n\n+------+------+------+--------+--------+--------+--------+--------+--------+\n| i    | f_1f | l_1f | f_1p1f | f_1p1f | f_2p1p | f_2p1p | f_1f2f | f_1f2f |\n+------+------+------+--------+--------+--------+--------+--------+--------+\n|    1 |    1 |    2 |      1 |      2 |   NULL |   NULL |      2 |      3 |\n|    2 |    2 |    3 |      1 |      3 |      1 |      1 |      3 |      4 |\n|    3 |    3 |    4 |      2 |      4 |      1 |      2 |      4 |      5 |\n|    4 |    4 |    5 |      3 |      5 |      2 |      3 |      5 |      6 |\n|    5 |    5 |    6 |      4 |      6 |      3 |      4 |      6 |      7 |\n|    6 |    6 |    7 |      5 |      7 |      4 |      5 |      7 |      8 |\n|    7 |    7 |    8 |      6 |      8 |      5 |      6 |      8 |      9 |\n|    8 |    8 |    9 |      7 |      9 |      6 |      7 |      9 |     10 |\n|    9 |    9 |   10 |      8 |     10 |      7 |      8 |     10 |     10 |\n|   10 |   10 |   10 |      9 |     10 |      8 |      9 |   NULL |   NULL |\n+------+------+------+--------+--------+--------+--------+--------+--------+\n\nURL: https://mariadb.com/kb/en/last_value/','','https://mariadb.com/kb/en/last_value/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (202,17,'PROCEDURE ANALYSE','Syntax\n------\n\nanalyse([max_elements[,max_memory]])\n\nDescription\n-----------\n\nThis procedure is defined in the sql/sql_analyse.cc file. It examines the\nresult from a query and returns an analysis of the results that suggests\noptimal data types for each column. To obtain this analysis, append PROCEDURE\nANALYSE to the end of a SELECT statement:\n\nSELECT ... FROM ... WHERE ... PROCEDURE ANALYSE([max_elements,[max_memory]])\n\nFor example:\n\nSELECT col1, col2 FROM table1 PROCEDURE ANALYSE(10, 2000);\n\nThe results show some statistics for the values returned by the query, and\npropose an optimal data type for the columns. This can be helpful for checking\nyour existing tables, or after importing new data. You may need to try\ndifferent settings for the arguments so that PROCEDURE ANALYSE() does not\nsuggest the ENUM data type when it is not appropriate.\n\nThe arguments are optional and are used as follows:\n\n* max_elements (default 256) is the maximum number of distinct values that\nanalyse notices per column. This is used by analyse to check whether the\noptimal data type should be of type ENUM; if there are more than max_elements\ndistinct values, then ENUM is not a suggested type.\n* max_memory (default 8192) is the maximum amount of memory that analyse\nshould allocate per column while trying to find all distinct values.\n\nURL: https://mariadb.com/kb/en/procedure-analyse/','','https://mariadb.com/kb/en/procedure-analyse/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (203,17,'ROW_COUNT','Syntax\n------\n\nROW_COUNT()\n\nDescription\n-----------\n\nROW_COUNT() returns the number of rows updated, inserted or deleted by the\npreceding statement. This is the same as the row count that the mysql client\ndisplays and the value from the mysql_affected_rows() C API function.\n\nGenerally:\n\n* For statements which return a result set (such as SELECT, SHOW, DESC or\nHELP), returns -1, even when the result set is empty. This is also true for\nadministrative statements, such as OPTIMIZE.\n* For DML statements other than SELECT and for ALTER TABLE, returns the number\nof affected rows.\n* For DDL statements (including TRUNCATE) and for other statements which don\'t\nreturn any result set (such as USE, DO, SIGNAL or DEALLOCATE PREPARE), returns\n0.\n\nFor UPDATE, affected rows is by default the number of rows that were actually\nchanged. If the CLIENT_FOUND_ROWS flag to mysql_real_connect() is specified\nwhen connecting to mysqld, affected rows is instead the number of rows matched\nby the WHERE clause.\n\nFor REPLACE, deleted rows are also counted. So, if REPLACE deletes a row and\nadds a new row, ROW_COUNT() returns 2.\n\nFor INSERT ... ON DUPLICATE KEY, updated rows are counted twice. So, if INSERT\nadds a new rows and modifies another row, ROW_COUNT() returns 3.\n\nROW_COUNT() does not take into account rows that are not directly\ndeleted/updated by the last statement. This means that rows deleted by foreign\nkeys or triggers are not counted.\n\nWarning: You can use ROW_COUNT() with prepared statements, but you need to\ncall it after EXECUTE, not after DEALLOCATE PREPARE, because the row count for\nallocate prepare is always 0.\n\nWarning: When used after a CALL statement, this function returns the number of\nrows affected by the last statement in the procedure, not by the whole\nprocedure.\n\nWarning: After INSERT DELAYED, ROW_COUNT() returns the number of the rows you\ntried to insert, not the number of the successful writes.\n\nThis information can also be found in the diagnostics area.\n\nStatements using the ROW_COUNT() function are not safe for replication.\n\nExamples\n--------\n\nCREATE TABLE t (A INT);\n\nINSERT INTO t VALUES(1),(2),(3);\n\nSELECT ROW_COUNT();\n+-------------+\n| ROW_COUNT() |\n+-------------+\n|           3 |\n+-------------+\n\nDELETE FROM t WHERE A IN(1,2);\n\nSELECT ROW_COUNT(); \n+-------------+\n| ROW_COUNT() |\n+-------------+\n|           2 |\n+-------------+\n\nExample with prepared statements:\n\nSET @q = \'INSERT INTO t VALUES(1),(2),(3);\';\n\nPREPARE stmt FROM @q;\n\nEXECUTE stmt;\nQuery OK, 3 rows affected (0.39 sec)\nRecords: 3  Duplicates: 0  Warnings: 0\n\nSELECT ROW_COUNT();\n+-------------+\n| ROW_COUNT() |\n+-------------+\n|           3 |\n+-------------+\n\nURL: https://mariadb.com/kb/en/row_count/','','https://mariadb.com/kb/en/row_count/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (204,17,'SCHEMA','Syntax\n------\n\nSCHEMA()\n\nDescription\n-----------\n\nThis function is a synonym for DATABASE().\n\nURL: https://mariadb.com/kb/en/schema/','','https://mariadb.com/kb/en/schema/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (205,17,'SESSION_USER','Syntax\n------\n\nSESSION_USER()\n\nDescription\n-----------\n\nSESSION_USER() is a synonym for USER().\n\nURL: https://mariadb.com/kb/en/session_user/','','https://mariadb.com/kb/en/session_user/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (206,17,'SYSTEM_USER','Syntax\n------\n\nSYSTEM_USER()\n\nDescription\n-----------\n\nSYSTEM_USER() is a synonym for USER().\n\nURL: https://mariadb.com/kb/en/system_user/','','https://mariadb.com/kb/en/system_user/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (207,17,'USER','Syntax\n------\n\nUSER()\n\nDescription\n-----------\n\nReturns the current MariaDB user name and host name, given when authenticating\nto MariaDB, as a string in the utf8 character set.\n\nNote that the value of USER() may differ from the value of CURRENT_USER(),\nwhich is the user used to authenticate the current client. CURRENT_ROLE()\nreturns the current active role.\n\nSYSTEM_USER() and SESSION_USER are synonyms for USER().\n\nStatements using the USER() function or one of its synonyms are not safe for\nstatement level replication.\n\nExamples\n--------\n\nshell> mysql --user=\"anonymous\"\n\nSELECT USER(),CURRENT_USER();\n+---------------------+----------------+\n| USER()              | CURRENT_USER() |\n+---------------------+----------------+\n| anonymous@localhost | @localhost     |\n+---------------------+----------------+\n\nTo select only the IP address, use SUBSTRING_INDEX(),\n\nSELECT SUBSTRING_INDEX(USER(), \'@\', -1);\n+----------------------------------+\n| SUBSTRING_INDEX(USER(), \'@\', -1) |\n+----------------------------------+\n| 192.168.0.101                    |\n+----------------------------------+\n\nURL: https://mariadb.com/kb/en/user/','','https://mariadb.com/kb/en/user/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (208,17,'VERSION','Syntax\n------\n\nVERSION()\n\nDescription\n-----------\n\nReturns a string that indicates the MariaDB server version. The string uses\nthe utf8 character set.\n\nExamples\n--------\n\nSELECT VERSION();\n+----------------+\n| VERSION()      |\n+----------------+\n| 10.4.7-MariaDB |\n+----------------+\n\nThe VERSION() string may have one or more of the following suffixes:\n\n+---------------------------+------------------------------------------------+\n| Suffix                    | Description                                    |\n+---------------------------+------------------------------------------------+\n| -embedded                 | The server is an embedded server (libmysqld).  |\n+---------------------------+------------------------------------------------+\n| -log                      | General logging, slow logging or binary        |\n|                           | (replication) logging is enabled.              |\n+---------------------------+------------------------------------------------+\n| -debug                    | The server is compiled for debugging.          |\n+---------------------------+------------------------------------------------+\n| -valgrind                 | The server is compiled to be instrumented      |\n|                           | with valgrind.                                 |\n+---------------------------+------------------------------------------------+\n\nChanging the Version String\n---------------------------\n\nSome old legacy code may break because they are parsing the VERSION string and\nexpecting a MySQL string or a simple version string like Joomla til API17, see\nMDEV-7780.\n\nFrom MariaDB 10.2, one can fool these applications by setting the version\nstring from the command line or the my.cnf files with --version=....\n\nURL: https://mariadb.com/kb/en/version/','','https://mariadb.com/kb/en/version/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (209,18,'Assignment Operator (:=)','Syntax\n------\n\nvar_name := expr\n\nDescription\n-----------\n\nAssignment operator for assigning a value. The value on the right is assigned\nto the variable on left.\n\nUnlike the = operator, := can always be used to assign a value to a variable.\n\nThis operator works with both user-defined variables and local variables.\n\nWhen assigning the same value to several variables, LAST_VALUE() can be useful.\n\nExamples\n--------\n\nSELECT @x := 10;\n+----------+\n| @x := 10 |\n+----------+\n|       10 |\n+----------+\n\nSELECT @x, @y := @x;\n+------+----------+\n| @x   | @y := @x |\n+------+----------+\n|   10 |       10 |\n+------+----------+\n\nURL: https://mariadb.com/kb/en/assignment-operator/','','https://mariadb.com/kb/en/assignment-operator/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (210,18,'Assignment Operator (=)','Syntax\n------\n\nidentifier = expr\n\nDescription\n-----------\n\nThe equal sign is used as both an assignment operator in certain contexts, and\nas a comparison operator. When used as assignment operator, the value on the\nright is assigned to the variable (or column, in some contexts) on the left.\n\nSince its use can be ambiguous, unlike the := assignment operator, the =\nassignment operator cannot be used in all contexts, and is only valid as part\nof a SET statement, or the SET clause of an UPDATE statement\n\nThis operator works with both user-defined variables and local variables.\n\nExamples\n--------\n\nUPDATE table_name SET x = 2 WHERE x > 100;\n\nSET @x = 1, @y := 2;\n\nURL: https://mariadb.com/kb/en/assignment-operators-assignment-operator/','','https://mariadb.com/kb/en/assignment-operators-assignment-operator/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (211,19,'Not Equal Operator','Syntax\n------\n\n<>, !=\n\nDescription\n-----------\n\nNot equal operator. Evaluates both SQL expressions and returns 1 if they are\nnot equal and 0 if they are equal, or NULL if either expression is NULL. If\nthe expressions return different data types, (for instance, a number and a\nstring), performs type conversion.\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) != (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a != t2.x) OR (t1.b != t2.y)\nFROM t1 INNER JOIN t2;\n\nExamples\n--------\n\nSELECT \'.01\' <> \'0.01\';\n+-----------------+\n| \'.01\' <> \'0.01\' |\n+-----------------+\n|               1 |\n+-----------------+\n\nSELECT .01 <> \'0.01\';\n+---------------+\n| .01 <> \'0.01\' |\n+---------------+\n|             0 |\n+---------------+\n\nSELECT \'zapp\' <> \'zappp\';\n+-------------------+\n| \'zapp\' <> \'zappp\' |\n+-------------------+\n|                 1 |\n+-------------------+\n\nURL: https://mariadb.com/kb/en/not-equal/','','https://mariadb.com/kb/en/not-equal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (212,19,'<','Syntax\n------\n\n<\n\nDescription\n-----------\n\nLess than operator. Evaluates both SQL expressions and returns 1 if the left\nvalue is less than the right value and 0 if it is not, or NULL if either\nexpression is NULL. If the expressions return different data types, (for\ninstance, a number and a string), performs type conversion.\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) < (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a < t2.x) OR ((t1.a = t2.x) AND (t1.b < t2.y))\nFROM t1 INNER JOIN t2;\n\nExamples\n--------\n\nSELECT 2 < 2;\n+-------+\n| 2 < 2 |\n+-------+\n|     0 |\n+-------+\n\nType conversion:\n\nSELECT 3<\'4\';\n+-------+\n| 3<\'4\' |\n+-------+\n|     1 |\n+-------+\n\nCase insensitivity - see Character Sets and Collations:\n\nSELECT \'a\'<\'A\';\n+---------+\n| \'a\'<\'A\' |\n+---------+\n|       0 |\n+---------+\n\nURL: https://mariadb.com/kb/en/less-than/','','https://mariadb.com/kb/en/less-than/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (213,19,'<=','Syntax\n------\n\n<=\n\nDescription\n-----------\n\nLess than or equal operator. Evaluates both SQL expressions and returns 1 if\nthe left value is less than or equal to the right value and 0 if it is not, or\nNULL if either expression is NULL. If the expressions return different data\ntypes, (for instance, a number and a string), performs type conversion.\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) <= (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a < t2.x) OR ((t1.a = t2.x) AND (t1.b <= t2.y))\nFROM t1 INNER JOIN t2;\n\nExamples\n--------\n\nSELECT 0.1 <= 2;\n+----------+\n| 0.1 <= 2 |\n+----------+\n|        1 |\n+----------+\n\nSELECT \'a\'<=\'A\';\n+----------+\n| \'a\'<=\'A\' |\n+----------+\n|        1 |\n+----------+\n\nURL: https://mariadb.com/kb/en/less-than-or-equal/','','https://mariadb.com/kb/en/less-than-or-equal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (214,19,'<=>','Syntax\n------\n\n<=>\n\nDescription\n-----------\n\nNULL-safe equal operator. It performs an equality comparison like the =\noperator, but returns 1 rather than NULL if both operands are NULL, and 0\nrather than NULL if one operand is NULL.\n\na <=> b is equivalent to a = b OR (a IS NULL AND b IS NULL).\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) <=> (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a <=> t2.x) AND (t1.b <=> t2.y)\nFROM t1 INNER JOIN t2;\n\nSee also NULL Values in MariaDB.\n\nExamples\n--------\n\nSELECT 1 <=> 1, NULL <=> NULL, 1 <=> NULL;\n+---------+---------------+------------+\n| 1 <=> 1 | NULL <=> NULL | 1 <=> NULL |\n+---------+---------------+------------+\n|       1 |             1 |          0 |\n+---------+---------------+------------+\n\nSELECT 1 = 1, NULL = NULL, 1 = NULL;\n+-------+-------------+----------+\n| 1 = 1 | NULL = NULL | 1 = NULL |\n+-------+-------------+----------+\n|     1 |        NULL |     NULL |\n+-------+-------------+----------+\n\nURL: https://mariadb.com/kb/en/null-safe-equal/','','https://mariadb.com/kb/en/null-safe-equal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (215,19,'=','Syntax\n------\n\nleft_expr = right_expr\n\nDescription\n-----------\n\nEqual operator. Evaluates both SQL expressions and returns 1 if they are\nequal, 0 if they are not equal, or NULL if either expression is NULL. If the\nexpressions return different data types (for example, a number and a string),\na type conversion is performed.\n\nWhen used in row comparisons these two queries are synonymous and return the\nsame results:\n\nSELECT (t1.a, t1.b) = (t2.x, t2.y) FROM t1 INNER JOIN t2;\n\nSELECT (t1.a = t2.x) AND (t1.b = t2.y) FROM t1 INNER JOIN t2;\n\nTo perform a NULL-safe comparison, use the <=> operator.\n\n= can also be used as an assignment operator.\n\nExamples\n--------\n\nSELECT 1 = 0;\n+-------+\n| 1 = 0 |\n+-------+\n|     0 |\n+-------+\n\nSELECT \'0\' = 0;\n+---------+\n| \'0\' = 0 |\n+---------+\n|       1 |\n+---------+\n\nSELECT \'0.0\' = 0;\n+-----------+\n| \'0.0\' = 0 |\n+-----------+\n|         1 |\n+-----------+\n\nSELECT \'0.01\' = 0;\n+------------+\n| \'0.01\' = 0 |\n+------------+\n|          0 |\n+------------+\n\nSELECT \'.01\' = 0.01;\n+--------------+\n| \'.01\' = 0.01 |\n+--------------+\n|            1 |\n+--------------+\n\nSELECT (5 * 2) = CONCAT(\'1\', \'0\');\n+----------------------------+\n| (5 * 2) = CONCAT(\'1\', \'0\') |\n+----------------------------+\n|                          1 |\n+----------------------------+\n\nSELECT 1 = NULL;\n+----------+\n| 1 = NULL |\n+----------+\n|     NULL |\n+----------+\n\nSELECT NULL = NULL;\n+-------------+\n| NULL = NULL |\n+-------------+\n|        NULL |\n+-------------+\n\nURL: https://mariadb.com/kb/en/equal/','','https://mariadb.com/kb/en/equal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (216,19,'>','Syntax\n------\n\n>\n\nDescription\n-----------\n\nGreater than operator. Evaluates both SQL expressions and returns 1 if the\nleft value is greater than the right value and 0 if it is not, or NULL if\neither expression is NULL. If the expressions return different data types,\n(for instance, a number and a string), performs type conversion.\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) > (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a > t2.x) OR ((t1.a = t2.x) AND (t1.b > t2.y))\nFROM t1 INNER JOIN t2;\n\nExamples\n--------\n\nSELECT 2 > 2;\n+-------+\n| 2 > 2 |\n+-------+\n|     0 |\n+-------+\n\nSELECT \'b\' > \'a\';\n+-----------+\n| \'b\' > \'a\' |\n+-----------+\n|         1 |\n+-----------+\n\nURL: https://mariadb.com/kb/en/greater-than/','','https://mariadb.com/kb/en/greater-than/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (217,19,'>=','Syntax\n------\n\n>=\n\nDescription\n-----------\n\nGreater than or equal operator. Evaluates both SQL expressions and returns 1\nif the left value is greater than or equal to the right value and 0 if it is\nnot, or NULL if either expression is NULL. If the expressions return different\ndata types, (for instance, a number and a string), performs type conversion.\n\nWhen used in row comparisons these two queries return the same results:\n\nSELECT (t1.a, t1.b) >= (t2.x, t2.y) \nFROM t1 INNER JOIN t2;\n\nSELECT (t1.a > t2.x) OR ((t1.a = t2.x) AND (t1.b >= t2.y))\nFROM t1 INNER JOIN t2;\n\nExamples\n--------\n\nSELECT 2 >= 2;\n+--------+\n| 2 >= 2 |\n+--------+\n|      1 |\n+--------+\n\nSELECT \'A\' >= \'a\';\n+------------+\n| \'A\' >= \'a\' |\n+------------+\n|          1 |\n+------------+\n\nURL: https://mariadb.com/kb/en/greater-than-or-equal/','','https://mariadb.com/kb/en/greater-than-or-equal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (218,19,'BETWEEN AND','Syntax\n------\n\nexpr BETWEEN min AND max\n\nDescription\n-----------\n\nIf expr is greater than or equal to min and expr is less than or equal to max,\nBETWEEN returns 1, otherwise it returns 0. This is equivalent to the\nexpression (min <= expr AND expr <= max) if all the arguments are of the same\ntype. Otherwise type conversion takes place according to the rules described\nat Type Conversion, but applied to all the three arguments.\n\nExamples\n--------\n\nSELECT 1 BETWEEN 2 AND 3;\n+-------------------+\n| 1 BETWEEN 2 AND 3 |\n+-------------------+\n|                 0 |\n+-------------------+\n\nSELECT \'b\' BETWEEN \'a\' AND \'c\';\n+-------------------------+\n| \'b\' BETWEEN \'a\' AND \'c\' |\n+-------------------------+\n|                       1 |\n+-------------------------+\n\nSELECT 2 BETWEEN 2 AND \'3\';\n+---------------------+\n| 2 BETWEEN 2 AND \'3\' |\n+---------------------+\n|                   1 |\n+---------------------+\n\nSELECT 2 BETWEEN 2 AND \'x-3\';\n+-----------------------+\n| 2 BETWEEN 2 AND \'x-3\' |\n+-----------------------+\n|                     0 |\n+-----------------------+\n1 row in set, 1 warning (0.00 sec)\n\nWarning (Code 1292): Truncated incorrect DOUBLE value: \'x-3\'\n\nNULL:\n\nSELECT 1 BETWEEN 1 AND NULL;\n+----------------------+\n| 1 BETWEEN 1 AND NULL |\n+----------------------+\n|                 NULL |\n+----------------------+\n\nDATE, DATETIME and TIMESTAMP examples. Omitting the time component compares\nagainst 00:00, so later times on the same date are not returned:\n\nCREATE TABLE `x` (\n a date ,\n b datetime,\n c timestamp\n)\n\nINSERT INTO x VALUES \n (\'2018-11-11\', \'2018-11-11 05:15\', \'2018-11-11 05:15\'), \n (\'2018-11-12\', \'2018-11-12 05:15\', \'2018-11-12 05:15\');\n\nSELECT * FROM x WHERE a BETWEEN \'2018-11-11\' AND \'2018-11-12\';\n+------------+---------------------+---------------------+\n| a          | b                   | c                   |\n+------------+---------------------+---------------------+\n| 2018-11-11 | 2018-11-11 05:15:00 | 2018-11-11 05:15:00 |\n| 2018-11-12 | 2018-11-12 05:15:00 | 2018-11-12 05:15:00 |\n+------------+---------------------+---------------------+\n\nSELECT * FROM x WHERE b BETWEEN \'2018-11-11\' AND \'2018-11-12\';\n+------------+---------------------+---------------------+\n| a          | b                   | c                   |\n+------------+---------------------+---------------------+\n| 2018-11-11 | 2018-11-11 05:15:00 | 2018-11-11 05:15:00 |\n+------------+---------------------+---------------------+\n\nSELECT * FROM x WHERE c BETWEEN \'2018-11-11\' AND \'2018-11-12\';\n+------------+---------------------+---------------------+\n| a          | b                   | c                   |\n+------------+---------------------+---------------------+\n| 2018-11-11 | 2018-11-11 05:15:00 | 2018-11-11 05:15:00 |\n+------------+---------------------+---------------------+\n\nURL: https://mariadb.com/kb/en/between-and/','','https://mariadb.com/kb/en/between-and/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (219,19,'COALESCE','Syntax\n------\n\nCOALESCE(value,...)\n\nDescription\n-----------\n\nReturns the first non-NULL value in the list, or NULL if there are no non-NULL\nvalues. At least one parameter must be passed.\n\nThe function is useful when substituting a default value for null values when\ndisplaying data.\n\nSee also NULL Values in MariaDB.\n\nExamples\n--------\n\nSELECT COALESCE(NULL,1);\n+------------------+\n| COALESCE(NULL,1) |\n+------------------+\n|                1 |\n+------------------+\n\nSELECT COALESCE(NULL,NULL,NULL);\n+--------------------------+\n| COALESCE(NULL,NULL,NULL) |\n+--------------------------+\n|                     NULL |\n+--------------------------+\n\nWhen two arguments are given, COALESCE() is the same as IFNULL():\n\nSET @a=NULL, @b=1;\n\nSELECT COALESCE(@a, @b), IFNULL(@a, @b);\n+------------------+----------------+\n| COALESCE(@a, @b) | IFNULL(@a, @b) |\n+------------------+----------------+\n|                1 |              1 |\n+------------------+----------------+\n\nHex type confusion:\n\nCREATE TABLE t1 (a INT, b VARCHAR(10));\nINSERT INTO t1 VALUES (0x31, 0x61),(COALESCE(0x31), COALESCE(0x61));\n\nSELECT * FROM t1;\n+------+------+\n| a    | b    |\n+------+------+\n|   49 | a    |\n|    1 | a    |\n+------+------+\n\nThe reason for the differing results above is that when 0x31 is inserted\ndirectly to the column, it\'s treated as a number (see Hexadecimal Literals),\nwhile when 0x31 is passed to COALESCE(), it\'s treated as a string, because:\n\n* HEX values have a string data type by default.\n* COALESCE() has the same data type as the argument.\n\nSubstituting zero for NULL (in this case when the aggregate function returns\nNULL after finding no rows):\n\nSELECT SUM(score) FROM student;\n+------------+\n| SUM(score) |\n+------------+\n|       NULL |\n+------------+\n\nSELECT COALESCE(SUM(score),0) FROM student;\n+------------------------+\n| COALESCE(SUM(score),0) |\n+------------------------+\n|                      0 |\n+------------------------+\n\nURL: https://mariadb.com/kb/en/coalesce/','','https://mariadb.com/kb/en/coalesce/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (220,19,'GREATEST','Syntax\n------\n\nGREATEST(value1,value2,...)\n\nDescription\n-----------\n\nWith two or more arguments, returns the largest (maximum-valued) argument. The\narguments are compared using the same rules as for LEAST().\n\nExamples\n--------\n\nSELECT GREATEST(2,0);\n+---------------+\n| GREATEST(2,0) |\n+---------------+\n|             2 |\n+---------------+\n\nSELECT GREATEST(34.0,3.0,5.0,767.0);\n+------------------------------+\n| GREATEST(34.0,3.0,5.0,767.0) |\n+------------------------------+\n|                        767.0 |\n+------------------------------+\n\nSELECT GREATEST(\'B\',\'A\',\'C\');\n+-----------------------+\n| GREATEST(\'B\',\'A\',\'C\') |\n+-----------------------+\n| C                     |\n+-----------------------+\n\nURL: https://mariadb.com/kb/en/greatest/','','https://mariadb.com/kb/en/greatest/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (221,19,'IN','Syntax\n------\n\nexpr IN (value,...)\n\nDescription\n-----------\n\nReturns 1 if expr is equal to any of the values in the IN list, else returns\n0. If all values are constants, they are evaluated according to the type of\nexpr and sorted. The search for the item then is done using a binary search.\nThis means IN is very quick if the IN value list consists entirely of\nconstants. Otherwise, type conversion takes place according to the rules\ndescribed at Type Conversion, but applied to all the arguments.\n\nIf expr is NULL, IN always returns NULL. If at least one of the values in the\nlist is NULL, and one of the comparisons is true, the result is 1. If at least\none of the values in the list is NULL and none of the comparisons is true, the\nresult is NULL.\n\nExamples\n--------\n\nSELECT 2 IN (0,3,5,7);\n+----------------+\n| 2 IN (0,3,5,7) |\n+----------------+\n|              0 |\n+----------------+\n\nSELECT \'wefwf\' IN (\'wee\',\'wefwf\',\'weg\');\n+----------------------------------+\n| \'wefwf\' IN (\'wee\',\'wefwf\',\'weg\') |\n+----------------------------------+\n|                                1 |\n+----------------------------------+\n\nType conversion:\n\nSELECT 1 IN (\'1\', \'2\', \'3\');\n+----------------------+\n| 1 IN (\'1\', \'2\', \'3\') |\n+----------------------+\n|                    1 |\n+----------------------+\n\nSELECT NULL IN (1, 2, 3);\n+-------------------+\n| NULL IN (1, 2, 3) |\n+-------------------+\n|              NULL |\n+-------------------+\n\nSELECT 1 IN (1, 2, NULL);\n+-------------------+\n| 1 IN (1, 2, NULL) |\n+-------------------+\n|                 1 |\n+-------------------+\n\nSELECT 5 IN (1, 2, NULL);\n+-------------------+\n| 5 IN (1, 2, NULL) |\n+-------------------+\n|              NULL |\n+-------------------+\n\nURL: https://mariadb.com/kb/en/in/','','https://mariadb.com/kb/en/in/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (222,19,'INTERVAL','Syntax\n------\n\nINTERVAL(N,N1,N2,N3,...)\n\nDescription\n-----------\n\nReturns the index of the last argument that is less than the first argument or\nis NULL.\n\nReturns 0 if N < N1, 1 if N < N2, 2 if N < N3 and so on or -1 if N is NULL.\nAll arguments are treated as integers. It is required that N1 < N2 < N3 < ...\n< Nn for this function to work correctly. This is because a fast binary search\nis used.\n\nExamples\n--------\n\nSELECT INTERVAL(23, 1, 15, 17, 30, 44, 200);\n+--------------------------------------+\n| INTERVAL(23, 1, 15, 17, 30, 44, 200) |\n+--------------------------------------+\n|                                    3 |\n+--------------------------------------+\n\nSELECT INTERVAL(10, 1, 10, 100, 1000);\n+--------------------------------+\n| INTERVAL(10, 1, 10, 100, 1000) |\n+--------------------------------+\n|                              2 |\n+--------------------------------+\n\nSELECT INTERVAL(22, 23, 30, 44, 200);\n+-------------------------------+\n| INTERVAL(22, 23, 30, 44, 200) |\n+-------------------------------+\n|                             0 |\n+-------------------------------+\n\nSELECT INTERVAL(10, 2, NULL);\n+-----------------------+\n| INTERVAL(10, 2, NULL) |\n+-----------------------+\n|                     2 |\n+-----------------------+\n\nURL: https://mariadb.com/kb/en/interval/','','https://mariadb.com/kb/en/interval/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (223,19,'IS','Syntax\n------\n\nIS boolean_value\n\nDescription\n-----------\n\nTests a value against a boolean value, where boolean_value can be TRUE, FALSE,\nor UNKNOWN.\n\nThere is an important difference between using IS TRUE or comparing a value\nwith TRUE using =. When using =, only 1 equals to TRUE. But when using IS\nTRUE, all values which are logically true (like a number > 1) return TRUE.\n\nExamples\n--------\n\nSELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN;\n+-----------+------------+-----------------+\n| 1 IS TRUE | 0 IS FALSE | NULL IS UNKNOWN |\n+-----------+------------+-----------------+\n|         1 |          1 |               1 |\n+-----------+------------+-----------------+\n\nDifference between = and IS TRUE:\n\nSELECT 2 = TRUE, 2 IS TRUE;\n+----------+-----------+\n| 2 = TRUE | 2 IS TRUE |\n+----------+-----------+\n|        0 |         1 |\n+----------+-----------+\n\nURL: https://mariadb.com/kb/en/is/','','https://mariadb.com/kb/en/is/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (224,19,'IS NOT','Syntax\n------\n\nIS NOT boolean_value\n\nDescription\n-----------\n\nTests a value against a boolean value, where boolean_value can be TRUE, FALSE,\nor UNKNOWN.\n\nExamples\n--------\n\nSELECT 1 IS NOT UNKNOWN, 0 IS NOT UNKNOWN, NULL IS NOT UNKNOWN;\n+------------------+------------------+---------------------+\n| 1 IS NOT UNKNOWN | 0 IS NOT UNKNOWN | NULL IS NOT UNKNOWN |\n+------------------+------------------+---------------------+\n|                1 |                1 |                   0 |\n+------------------+------------------+---------------------+\n\nSELECT NULL IS NOT TRUE, NULL IS NOT FALSE;\n+------------------+-------------------+\n| NULL IS NOT TRUE | NULL IS NOT FALSE |\n+------------------+-------------------+\n|                1 |                 1 |\n+------------------+-------------------+\n\nURL: https://mariadb.com/kb/en/is-not/','','https://mariadb.com/kb/en/is-not/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (225,19,'IS NOT NULL','Syntax\n------\n\nIS NOT NULL\n\nDescription\n-----------\n\nTests whether a value is not NULL. See also NULL Values in MariaDB.\n\nExamples\n--------\n\nSELECT 1 IS NOT NULL, 0 IS NOT NULL, NULL IS NOT NULL;\n+---------------+---------------+------------------+\n| 1 IS NOT NULL | 0 IS NOT NULL | NULL IS NOT NULL |\n+---------------+---------------+------------------+\n|             1 |             1 |                0 |\n+---------------+---------------+------------------+\n\nURL: https://mariadb.com/kb/en/is-not-null/','','https://mariadb.com/kb/en/is-not-null/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (226,19,'IS NULL','Syntax\n------\n\nIS NULL\n\nDescription\n-----------\n\nTests whether a value is NULL. See also NULL Values in MariaDB.\n\nExamples\n--------\n\nSELECT 1 IS NULL, 0 IS NULL, NULL IS NULL;\n+-----------+-----------+--------------+\n| 1 IS NULL | 0 IS NULL | NULL IS NULL |\n+-----------+-----------+--------------+\n|         0 |         0 |            1 |\n+-----------+-----------+--------------+\n\nCompatibility\n-------------\n\nSome ODBC applications use the syntax auto_increment_field IS NOT NULL to find\nthe latest row that was inserted with an autogenerated key value. If your\napplications need this, you can set the sql_auto_is_null variable to 1.\n\nSET @@sql_auto_is_null=1;\nCREATE TABLE t1 (auto_increment_column INT NOT NULL AUTO_INCREMENT PRIMARY\nKEY);\nINSERT INTO t1 VALUES (NULL);\nSELECT * FROM t1 WHERE auto_increment_column IS NULL;\n\n+-----------------------+\n| auto_increment_column |\n+-----------------------+\n|                     1 |\n+-----------------------+\n\nURL: https://mariadb.com/kb/en/is-null/','','https://mariadb.com/kb/en/is-null/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (227,19,'ISNULL','Syntax\n------\n\nISNULL(expr)\n\nDescription\n-----------\n\nIf expr is NULL, ISNULL() returns 1, otherwise it returns 0.\n\nSee also NULL Values in MariaDB.\n\nExamples\n--------\n\nSELECT ISNULL(1+1);\n+-------------+\n| ISNULL(1+1) |\n+-------------+\n|           0 |\n+-------------+\n\nSELECT ISNULL(1/0);\n+-------------+\n| ISNULL(1/0) |\n+-------------+\n|           1 |\n+-------------+\n\nURL: https://mariadb.com/kb/en/isnull/','','https://mariadb.com/kb/en/isnull/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (228,19,'LEAST','Syntax\n------\n\nLEAST(value1,value2,...)\n\nDescription\n-----------\n\nWith two or more arguments, returns the smallest (minimum-valued) argument.\nThe arguments are compared using the following rules:\n\n* If the return value is used in an INTEGER context or all arguments are\ninteger-valued, they are compared as integers.\n* If the return value is used in a REAL context or all arguments are\nreal-valued, they are compared as reals.\n* If any argument is a case-sensitive string, the arguments are compared as\ncase-sensitive strings.\n* In all other cases, the arguments are compared as case-insensitive strings.\n\nLEAST() returns NULL if any argument is NULL.\n\nExamples\n--------\n\nSELECT LEAST(2,0);\n+------------+\n| LEAST(2,0) |\n+------------+\n|          0 |\n+------------+\n\nSELECT LEAST(34.0,3.0,5.0,767.0);\n+---------------------------+\n| LEAST(34.0,3.0,5.0,767.0) |\n+---------------------------+\n|                       3.0 |\n+---------------------------+\n\nSELECT LEAST(\'B\',\'A\',\'C\');\n+--------------------+\n| LEAST(\'B\',\'A\',\'C\') |\n+--------------------+\n| A                  |\n+--------------------+\n\nURL: https://mariadb.com/kb/en/least/','','https://mariadb.com/kb/en/least/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (229,19,'NOT BETWEEN','Syntax\n------\n\nexpr NOT BETWEEN min AND max\n\nDescription\n-----------\n\nThis is the same as NOT (expr BETWEEN min AND max).\n\nNote that the meaning of the alternative form NOT expr BETWEEN min AND max is\naffected by the HIGH_NOT_PRECEDENCE SQL_MODE flag.\n\nExamples\n--------\n\nSELECT 1 NOT BETWEEN 2 AND 3;\n+-----------------------+\n| 1 NOT BETWEEN 2 AND 3 |\n+-----------------------+\n|                     1 |\n+-----------------------+\n\nSELECT \'b\' NOT BETWEEN \'a\' AND \'c\';\n+-----------------------------+\n| \'b\' NOT BETWEEN \'a\' AND \'c\' |\n+-----------------------------+\n|                           0 |\n+-----------------------------+\n\nNULL:\n\nSELECT 1 NOT BETWEEN 1 AND NULL;\n+--------------------------+\n| 1 NOT BETWEEN 1 AND NULL |\n+--------------------------+\n|                     NULL |\n+--------------------------+\n\nURL: https://mariadb.com/kb/en/not-between/','','https://mariadb.com/kb/en/not-between/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (230,19,'NOT IN','Syntax\n------\n\nexpr NOT IN (value,...)\n\nDescription\n-----------\n\nThis is the same as NOT (expr IN (value,...)).\n\nExamples\n--------\n\nSELECT 2 NOT IN (0,3,5,7);\n+--------------------+\n| 2 NOT IN (0,3,5,7) |\n+--------------------+\n|                  1 |\n+--------------------+\n\nSELECT \'wefwf\' NOT IN (\'wee\',\'wefwf\',\'weg\');\n+--------------------------------------+\n| \'wefwf\' NOT IN (\'wee\',\'wefwf\',\'weg\') |\n+--------------------------------------+\n|                                    0 |\n+--------------------------------------+\n\nSELECT 1 NOT IN (\'1\', \'2\', \'3\');\n+--------------------------+\n| 1 NOT IN (\'1\', \'2\', \'3\') |\n+--------------------------+\n|                        0 |\n+--------------------------+\n\nNULL:\n\nSELECT NULL NOT IN (1, 2, 3);\n+-----------------------+\n| NULL NOT IN (1, 2, 3) |\n+-----------------------+\n|                  NULL |\n+-----------------------+\n\nSELECT 1 NOT IN (1, 2, NULL);\n+-----------------------+\n| 1 NOT IN (1, 2, NULL) |\n+-----------------------+\n|                     0 |\n+-----------------------+\n\nSELECT 5 NOT IN (1, 2, NULL);\n+-----------------------+\n| 5 NOT IN (1, 2, NULL) |\n+-----------------------+\n|                  NULL |\n+-----------------------+\n\nURL: https://mariadb.com/kb/en/not-in/','','https://mariadb.com/kb/en/not-in/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (231,20,'&','Syntax\n------\n\n&\n\nDescription\n-----------\n\nBitwise AND. Converts the values to binary and compares bits. Only if both the\ncorresponding bits are 1 is the resulting bit also 1.\n\nSee also bitwise OR.\n\nExamples\n--------\n\nSELECT 2&1;\n+-----+\n| 2&1 |\n+-----+\n|   0 |\n+-----+\n\nSELECT 3&1;\n+-----+\n| 3&1 |\n+-----+\n|   1 |\n+-----+\n\nSELECT 29 & 15;\n+---------+\n| 29 & 15 |\n+---------+\n|      13 |\n+---------+\n\nURL: https://mariadb.com/kb/en/bitwise_and/','','https://mariadb.com/kb/en/bitwise_and/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (232,20,'<<','Syntax\n------\n\nvalue1 << value2\n\nDescription\n-----------\n\nConverts a longlong (BIGINT) number (value1) to binary and shifts value2 units\nto the left.\n\nExamples\n--------\n\nSELECT 1 << 2;\n+--------+\n| 1 << 2 |\n+--------+\n|      4 |\n+--------+\n\nURL: https://mariadb.com/kb/en/shift-left/','','https://mariadb.com/kb/en/shift-left/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (233,20,'>>','Syntax\n------\n\nvalue1 >> value2\n\nDescription\n-----------\n\nConverts a longlong (BIGINT) number (value1) to binary and shifts value2 units\nto the right.\n\nExamples\n--------\n\nSELECT 4 >> 2;\n+--------+\n| 4 >> 2 |\n+--------+\n|      1 |\n+--------+\n\nURL: https://mariadb.com/kb/en/shift-right/','','https://mariadb.com/kb/en/shift-right/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (234,20,'BIT_COUNT','Syntax\n------\n\nBIT_COUNT(N)\n\nDescription\n-----------\n\nReturns the number of bits that are set in the argument N.\n\nExamples\n--------\n\nSELECT BIT_COUNT(29), BIT_COUNT(b\'101010\');\n+---------------+----------------------+\n| BIT_COUNT(29) | BIT_COUNT(b\'101010\') |\n+---------------+----------------------+\n|             4 |                    3 |\n+---------------+----------------------+\n\nURL: https://mariadb.com/kb/en/bit_count/','','https://mariadb.com/kb/en/bit_count/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (235,20,'^','Syntax\n------\n\n^\n\nDescription\n-----------\n\nBitwise XOR. Converts the values to binary and compares bits. If one (and only\none) of the corresponding bits is 1 is the resulting bit also 1.\n\nExamples\n--------\n\nSELECT 1 ^ 1;\n+-------+\n| 1 ^ 1 |\n+-------+\n|     0 |\n+-------+\n\nSELECT 1 ^ 0;\n+-------+\n| 1 ^ 0 |\n+-------+\n|     1 |\n+-------+\n\nSELECT 11 ^ 3;\n+--------+\n| 11 ^ 3 |\n+--------+\n|      8 |\n+--------+\n\nURL: https://mariadb.com/kb/en/bitwise-xor/','','https://mariadb.com/kb/en/bitwise-xor/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (236,20,'|','Syntax\n------\n\n|\n\nDescription\n-----------\n\nBitwise OR. Converts the values to binary and compares bits. If either of the\ncorresponding bits has a value of 1, the resulting bit is also 1.\n\nSee also bitwise AND.\n\nExamples\n--------\n\nSELECT 2|1;\n+-----+\n| 2|1 |\n+-----+\n|   3 |\n+-----+\n\nSELECT 29 | 15;\n+---------+\n| 29 | 15 |\n+---------+\n|      31 |\n+---------+\n\nURL: https://mariadb.com/kb/en/bitwise-or/','','https://mariadb.com/kb/en/bitwise-or/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (237,20,'~','Syntax\n------\n\n~\n\nDescription\n-----------\n\nBitwise NOT. Converts the value to 4 bytes binary and inverts all bits.\n\nExamples\n--------\n\nSELECT 3 & ~1;\n+--------+\n| 3 & ~1 |\n+--------+\n|      2 |\n+--------+\n\nSELECT 5 & ~1;\n+--------+\n| 5 & ~1 |\n+--------+\n|      4 |\n+--------+\n\nURL: https://mariadb.com/kb/en/bitwise-not/','','https://mariadb.com/kb/en/bitwise-not/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (238,20,'Parentheses','Parentheses are sometimes called precedence operators - this means that they\ncan be used to change the other operator\'s precedence in an expression. The\nexpressions that are written between parentheses are computed before the\nexpressions that are written outside. Parentheses must always contain an\nexpression (that is, they cannot be empty), and can be nested.\n\nFor example, the following expressions could return different results:\n\n* NOT a OR b\n* NOT (a OR b)\n\nIn the first case, NOT applies to a, so if a is FALSE or b is TRUE, the\nexpression returns TRUE. In the second case, NOT applies to the result of a OR\nb, so if at least one of a or b is TRUE, the expression is TRUE.\n\nWhen the precedence of operators is not intuitive, you can use parentheses to\nmake it immediately clear for whoever reads the statement.\n\nThe precedence of the NOT operator can also be affected by the\nHIGH_NOT_PRECEDENCE SQL_MODE flag.\n\nOther uses\n----------\n\nParentheses must always be used to enclose subqueries.\n\nParentheses can also be used in a JOIN statement between multiple tables to\ndetermine which tables must be joined first.\n\nAlso, parentheses are used to enclose the list of parameters to be passed to\nbuilt-in functions, user-defined functions and stored routines. However, when\nno parameter is passed to a stored procedure, parentheses are optional. For\nbuiltin functions and user-defined functions, spaces are not allowed between\nthe function name and the open parenthesis, unless the IGNORE_SPACE SQL_MODE\nis set. For stored routines (and for functions if IGNORE_SPACE is set) spaces\nare allowed before the open parenthesis, including tab characters and new line\ncharacters.\n\nSyntax errors\n-------------\n\nIf there are more open parentheses than closed parentheses, the error usually\nlooks like this:\n\nERROR 1064 (42000): You have an error in your SQL syntax; check the manual that\ncorresponds to your MariaDB server version for the right syntax to use near \'\'\na\nt line 1\n\nNote the empty string.\n\nIf there are more closed parentheses than open parentheses, the error usually\nlooks like this:\n\nERROR 1064 (42000): You have an error in your SQL syntax; check the manual that\ncorresponds to your MariaDB server version for the right syntax to use near \')\'\nat line 1\n\nNote the quoted closed parenthesis.\n\nURL: https://mariadb.com/kb/en/parentheses/','','https://mariadb.com/kb/en/parentheses/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (239,20,'TRUE FALSE','Description\n-----------\n\nThe constants TRUE and FALSE evaluate to 1 and 0, respectively. The constant\nnames can be written in any lettercase.\n\nExamples\n--------\n\nSELECT TRUE, true, FALSE, false;\n+------+------+-------+-------+\n| TRUE | TRUE | FALSE | FALSE |\n+------+------+-------+-------+\n|    1 |    1 |     0 |     0 |\n+------+------+-------+-------+\n\nURL: https://mariadb.com/kb/en/true-false/','','https://mariadb.com/kb/en/true-false/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (240,21,'ANALYZE TABLE','Syntax\n------\n\nANALYZE [NO_WRITE_TO_BINLOG | LOCAL] TABLE tbl_name [,tbl_name ...] \n [PERSISTENT FOR [ALL|COLUMNS ([col_name [,col_name ...]])]\n  [INDEXES ([index_name [,index_name ...]])]]\n\nDescription\n-----------\n\nANALYZE TABLE analyzes and stores the key distribution for a table (index\nstatistics). This statement works with MyISAM, Aria and InnoDB tables. During\nthe analysis, InnoDB will allow reads/writes, and MyISAM/Aria reads/inserts.\nFor MyISAM tables, this statement is equivalent to using myisamchk --analyze.\n\nFor more information on how the analysis works within InnoDB, see InnoDB\nLimitations.\n\nMariaDB uses the stored key distribution to decide the order in which tables\nshould be joined when you perform a join on something other than a constant.\nIn addition, key distributions can be used when deciding which indexes to use\nfor a specific table within a query.\n\nThis statement requires SELECT and INSERT privileges for the table.\n\nBy default, ANALYZE TABLE statements are written to the binary log and will be\nreplicated. The NO_WRITE_TO_BINLOG keyword (LOCAL is an alias) will ensure the\nstatement is not written to the binary log.\n\nFrom MariaDB 10.3.19, ANALYZE TABLE statements are not logged to the binary\nlog if read_only is set. See also Read-Only Replicas.\n\nANALYZE TABLE is also supported for partitioned tables. You can use ALTER\nTABLE ... ANALYZE PARTITION to analyze one or more partitions.\n\nThe Aria storage engine supports progress reporting for the ANALYZE TABLE\nstatement.\n\nEngine-Independent Statistics\n-----------------------------\n\nANALYZE TABLE supports engine-independent statistics. See Engine-Independent\nTable Statistics: Collecting Statistics with the ANALYZE TABLE Statement for\nmore information.\n\nURL: https://mariadb.com/kb/en/analyze-table/','','https://mariadb.com/kb/en/analyze-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (241,21,'CHECK TABLE','Syntax\n------\n\nCHECK TABLE tbl_name [, tbl_name] ... [option] ...\n\noption = {FOR UPGRADE | QUICK | FAST | MEDIUM | EXTENDED | CHANGED}\n\nDescription\n-----------\n\nCHECK TABLE checks a table or tables for errors. CHECK TABLE works for\nArchive, Aria, CSV, InnoDB, and MyISAM tables. For Aria and MyISAM tables, the\nkey statistics are updated as well. For CSV, see also Checking and Repairing\nCSV Tables.\n\nAs an alternative, myisamchk is a commandline tool for checking MyISAM tables\nwhen the tables are not being accessed.\n\nFor checking dynamic columns integrity, COLUMN_CHECK() can be used.\n\nCHECK TABLE can also check views for problems, such as tables that are\nreferenced in the view definition that no longer exist.\n\nCHECK TABLE is also supported for partitioned tables. You can use ALTER TABLE\n... CHECK PARTITION to check one or more partitions.\n\nThe meaning of the different options are as follows - note that this can vary\na bit between storage engines:\n\n+-----+----------------------------------------------------------------------+\n| FOR | Do a very quick check if the storage format for the table has        |\n| UPG | changed so that one needs to do a REPAIR. This is only needed when   |\n| ADE | one upgrades between major versions of MariaDB or MySQL. This is     |\n|     | usually done by running mysql_upgrade.                               |\n+-----+----------------------------------------------------------------------+\n| FAS | Only check tables that has not been closed properly or are marked    |\n|     | as corrupt. Only supported by the MyISAM and Aria engines. For       |\n|     | other  engines the table is checked normally                         |\n+-----+----------------------------------------------------------------------+\n| CHA | Check only tables that has changed since last REPAIR / CHECK. Only   |\n| GED | supported by the MyISAM and Aria engines. For other  engines the     |\n|     | table is checked normally.                                           |\n+-----+----------------------------------------------------------------------+\n| QUI | Do a fast check. For MyISAM and Aria engine this means we skip       |\n| K   | checking the delete link chain which may take some time.             |\n+-----+----------------------------------------------------------------------+\n| MED | Scan also the data files. Checks integrity between data and index    |\n| UM  | files with checksums. In most cases this should find all possible    |\n|     | errors.                                                              |\n+-----+----------------------------------------------------------------------+\n| EXT | Does a full check to verify every possible error. For MyISAM and     |\n| NDE | Aria we verify for each row that all it keys exists and points to    |\n|     | the row. This may take a long time on big tables!                    |\n+-----+----------------------------------------------------------------------+\n\nFor most cases running CHECK TABLE without options or MEDIUM should be good\nenough.\n\nThe Aria storage engine supports progress reporting for this statement.\n\nIf you want to know if two tables are identical, take a look at CHECKSUM TABLE.\n\nInnoDB\n------\n\nIf CHECK TABLE finds an error in an InnoDB table, MariaDB might shutdown to\nprevent the error propagation. In this case, the problem will be reported in\nthe error log. Otherwise the table or an index might be marked as corrupted,\nto prevent use. This does not happen with some minor problems, like a wrong\nnumber of entries in a secondary index. Those problems are reported in the\noutput of CHECK TABLE.\n\nEach tablespace contains a header with metadata. This header is not checked by\nthis statement.\n\nDuring the execution of CHECK TABLE, other threads may be blocked.\n\nURL: https://mariadb.com/kb/en/check-table/','','https://mariadb.com/kb/en/check-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (242,21,'CHECK VIEW','Syntax\n------\n\nCHECK VIEW view_name\n\nDescription\n-----------\n\nThe CHECK VIEW statement was introduced in MariaDB 10.0.18 to assist with\nfixing MDEV-6916, an issue introduced in MariaDB 5.2 where the view algorithms\nwere swapped. It checks whether the view algorithm is correct. It is run as\npart of mysql_upgrade, and should not normally be required in regular use.\n\nURL: https://mariadb.com/kb/en/check-view/','','https://mariadb.com/kb/en/check-view/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (243,21,'CHECKSUM TABLE','Syntax\n------\n\nCHECKSUM TABLE tbl_name [, tbl_name] ... [ QUICK | EXTENDED ]\n\nDescription\n-----------\n\nCHECKSUM TABLE reports a table checksum. This is very useful if you want to\nknow if two tables are the same (for example on a master and slave).\n\nWith QUICK, the live table checksum is reported if it is available, or NULL\notherwise. This is very fast. A live checksum is enabled by specifying the\nCHECKSUM=1 table option when you create the table; currently, this is\nsupported only for Aria and MyISAM tables.\n\nWith EXTENDED, the entire table is read row by row and the checksum is\ncalculated. This can be very slow for large tables.\n\nIf neither QUICK nor EXTENDED is specified, MariaDB returns a live checksum if\nthe table storage engine supports it and scans the table otherwise.\n\nCHECKSUM TABLE requires the SELECT privilege for the table.\n\nFor a nonexistent table, CHECKSUM TABLE returns NULL and generates a warning.\n\nThe table row format affects the checksum value. If the row format changes,\nthe checksum will change. This means that when a table created with a\nMariaDB/MySQL version is upgraded to another version, the checksum value will\nprobably change.\n\nTwo identical tables should always match to the same checksum value; however,\nalso for non-identical tables there is a very slight chance that they will\nreturn the same value as the hashing algorithm is not completely\ncollision-free.\n\nDifferences Between MariaDB and MySQL\n-------------------------------------\n\nCHECKSUM TABLE may give a different result as MariaDB doesn\'t ignore NULLs in\nthe columns as MySQL 5.1 does (Later MySQL versions should calculate checksums\nthe same way as MariaDB). You can get the \'old style\' checksum in MariaDB by\nstarting mysqld with the --old option. Note however that that the MyISAM and\nAria storage engines in MariaDB are using the new checksum internally, so if\nyou are using --old, the CHECKSUM command will be slower as it needs to\ncalculate the checksum row by row. Starting from MariaDB Server 10.9, --old is\ndeprecated and will be removed in a future release. Set --old-mode or OLD_MODE\nto COMPAT_5_1_CHECKSUM to get \'old style\' checksum.\n\nURL: https://mariadb.com/kb/en/checksum-table/','','https://mariadb.com/kb/en/checksum-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (244,21,'OPTIMIZE TABLE','Syntax\n------\n\nOPTIMIZE [NO_WRITE_TO_BINLOG | LOCAL] TABLE\n  tbl_name [, tbl_name] ...\n  [WAIT n | NOWAIT]\n\nDescription\n-----------\n\nOPTIMIZE TABLE has two main functions. It can either be used to defragment\ntables, or to update the InnoDB fulltext index.\n\nMariaDB starting with 10.3.0\n----------------------------\n\nWAIT/NOWAIT\n-----------\n\nSet the lock wait timeout. See WAIT and NOWAIT.\n\nDefragmenting\n-------------\n\nOPTIMIZE TABLE works for InnoDB (before MariaDB 10.1.1, only if the\ninnodb_file_per_table server system variable is set), Aria, MyISAM and ARCHIVE\ntables, and should be used if you have deleted a large part of a table or if\nyou have made many changes to a table with variable-length rows (tables that\nhave VARCHAR, VARBINARY, BLOB, or TEXT columns). Deleted rows are maintained\nin a linked list and subsequent INSERT operations reuse old row positions.\n\nThis statement requires SELECT and INSERT privileges for the table.\n\nBy default, OPTIMIZE TABLE statements are written to the binary log and will\nbe replicated. The NO_WRITE_TO_BINLOG keyword (LOCAL is an alias) will ensure\nthe statement is not written to the binary log.\n\nFrom MariaDB 10.3.19, OPTIMIZE TABLE statements are not logged to the binary\nlog if read_only is set. See also Read-Only Replicas.\n\nOPTIMIZE TABLE is also supported for partitioned tables. You can use ALTER\nTABLE ... OPTIMIZE PARTITION to optimize one or more partitions.\n\nYou can use OPTIMIZE TABLE to reclaim the unused space and to defragment the\ndata file. With other storage engines, OPTIMIZE TABLE does nothing by default,\nand returns this message: \" The storage engine for the table doesn\'t support\noptimize\". However, if the server has been started with the --skip-new option,\nOPTIMIZE TABLE is linked to ALTER TABLE, and recreates the table. This\noperation frees the unused space and updates index statistics.\n\nThe Aria storage engine supports progress reporting for this statement.\n\nIf a MyISAM table is fragmented, concurrent inserts will not be performed\nuntil an OPTIMIZE TABLE statement is executed on that table, unless the\nconcurrent_insert server system variable is set to ALWAYS.\n\nUpdating an InnoDB fulltext index\n---------------------------------\n\nWhen rows are added or deleted to an InnoDB fulltext index, the index is not\nimmediately re-organized, as this can be an expensive operation. Change\nstatistics are stored in a separate location . The fulltext index is only\nfully re-organized when an OPTIMIZE TABLE statement is run.\n\nBy default, an OPTIMIZE TABLE will defragment a table. In order to use it to\nupdate fulltext index statistics, the innodb_optimize_fulltext_only system\nvariable must be set to 1. This is intended to be a temporary setting, and\nshould be reset to 0 once the fulltext index has been re-organized.\n\nSince fulltext re-organization can take a long time, the\ninnodb_ft_num_word_optimize variable limits the re-organization to a number of\nwords (2000 by default). You can run multiple OPTIMIZE statements to fully\nre-organize the index.\n\nDefragmenting InnoDB tablespaces\n--------------------------------\n\nMariaDB 10.1.1 merged the Facebook/Kakao defragmentation patch, allowing one\nto use OPTIMIZE TABLE to defragment InnoDB tablespaces. For this functionality\nto be enabled, the innodb_defragment system variable must be enabled. No new\ntables are created and there is no need to copy data from old tables to new\ntables. Instead, this feature loads n pages (determined by\ninnodb-defragment-n-pages) and tries to move records so that pages would be\nfull of records and then frees pages that are fully empty after the operation.\nNote that tablespace files (including ibdata1) will not shrink as the result\nof defragmentation, but one will get better memory utilization in the InnoDB\nbuffer pool as there are fewer data pages in use.\n\nSee Defragmenting InnoDB Tablespaces for more details.\n\nURL: https://mariadb.com/kb/en/optimize-table/','','https://mariadb.com/kb/en/optimize-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (245,21,'REPAIR TABLE','Syntax\n------\n\nREPAIR [NO_WRITE_TO_BINLOG | LOCAL] TABLE\n  tbl_name [, tbl_name] ...\n  [QUICK] [EXTENDED] [USE_FRM]\n\nDescription\n-----------\n\nREPAIR TABLE repairs a possibly corrupted table. By default, it has the same\neffect as\n\nmyisamchk --recover tbl_name\n\nor\n\naria_chk --recover tbl_name\n\nSee aria_chk and myisamchk for more.\n\nREPAIR TABLE works for Archive, Aria, CSV and MyISAM tables. For InnoDB, see\nrecovery modes. For CSV, see also Checking and Repairing CSV Tables. For\nArchive, this statement also improves compression. If the storage engine does\nnot support this statement, a warning is issued.\n\nThis statement requires SELECT and INSERT privileges for the table.\n\nBy default, REPAIR TABLE statements are written to the binary log and will be\nreplicated. The NO_WRITE_TO_BINLOG keyword (LOCAL is an alias) will ensure the\nstatement is not written to the binary log.\n\nFrom MariaDB 10.3.19, REPAIR TABLE statements are not logged to the binary log\nif read_only is set. See also Read-Only Replicas.\n\nWhen an index is recreated, the storage engine may use a configurable buffer\nin the process. Incrementing the buffer speeds up the index creation. Aria and\nMyISAM allocate a buffer whose size is defined by aria_sort_buffer_size or\nmyisam_sort_buffer_size, also used for ALTER TABLE.\n\nREPAIR TABLE is also supported for partitioned tables. However, the USE_FRM\noption cannot be used with this statement on a partitioned table.\n\nALTER TABLE ... REPAIR PARTITION can be used to repair one or more partitions.\n\nThe Aria storage engine supports progress reporting for this statement.\n\nURL: https://mariadb.com/kb/en/repair-table/','','https://mariadb.com/kb/en/repair-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (246,21,'REPAIR VIEW','Syntax\n------\n\nREPAIR [NO_WRITE_TO_BINLOG | LOCAL] VIEW  view_name[, view_name] ... [FROM\nMYSQL]\n\nDescription\n-----------\n\nThe REPAIR VIEW statement was introduced to assist with fixing MDEV-6916, an\nissue introduced in MariaDB 5.2 where the view algorithms were swapped\ncompared to their MySQL on disk representation. It checks whether the view\nalgorithm is correct. It is run as part of mysql_upgrade, and should not\nnormally be required in regular use.\n\nBy default it corrects the checksum and if necessary adds the mariadb-version\nfield. If the optional FROM MYSQL clause is used, and no mariadb-version field\nis present, the MERGE and TEMPTABLE algorithms are toggled.\n\nBy default, REPAIR VIEW statements are written to the binary log and will be\nreplicated. The NO_WRITE_TO_BINLOG keyword (LOCAL is an alias) will ensure the\nstatement is not written to the binary log.\n\nURL: https://mariadb.com/kb/en/repair-view/','','https://mariadb.com/kb/en/repair-view/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (247,22,'mysql.func Table','The mysql.func table stores information about user-defined functions (UDFs)\ncreated with the CREATE FUNCTION UDF statement.\n\nMariaDB starting with 10.4\n--------------------------\nIn MariaDB 10.4 and later, this table uses the Aria storage engine.\n\nMariaDB until 10.3\n------------------\nIn MariaDB 10.3 and before, this table uses the MyISAM storage engine.\n\nThe mysql.func table contains the following fields:\n\n+----------+---------+---------+-------+--------------+---------------------+\n| Field    | Type    | Null    | Key   | Default      | Description         |\n+----------+---------+---------+-------+--------------+---------------------+\n| name     | char(64 | NO      | PRI   |              | UDF name            |\n|          |         |         |       |              |                     |\n+----------+---------+---------+-------+--------------+---------------------+\n| ret      | tinyint | NO      |       | 0            |                     |\n|          | 1)      |         |       |              |                     |\n+----------+---------+---------+-------+--------------+---------------------+\n| dl       | char(12 | NO      |       |              | Shared library name |\n|          | )       |         |       |              |                     |\n+----------+---------+---------+-------+--------------+---------------------+\n| type     | enum(\'f | NO      |       | NULL         | Type, either        |\n|          | nction\' |         |       |              | function or         |\n|          | \'aggreg |         |       |              | aggregate.          |\n|          | te\')    |         |       |              | Aggregate           |\n|          |         |         |       |              | functions are       |\n|          |         |         |       |              | summary functions   |\n|          |         |         |       |              | such as SUM() and   |\n|          |         |         |       |              | AVG().              |\n+----------+---------+---------+-------+--------------+---------------------+\n\nExample\n-------\n\nSELECT * FROM mysql.func;\n+------------------------------+-----+--------------+-----------+\n| name                         | ret | dl           | type      |\n+------------------------------+-----+--------------+-----------+\n| spider_direct_sql            |   2 | ha_spider.so | function  |\n| spider_bg_direct_sql         |   2 | ha_spider.so | aggregate |\n| spider_ping_table            |   2 | ha_spider.so | function  |\n| spider_copy_tables           |   2 | ha_spider.so | function  |\n| spider_flush_table_mon_cache |   2 | ha_spider.so | function  |\n+------------------------------+-----+--------------+-----------+\n\nURL: https://mariadb.com/kb/en/mysqlfunc-table/','','https://mariadb.com/kb/en/mysqlfunc-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (248,22,'CREATE FUNCTION UDF','Syntax\n------\n\nCREATE [OR REPLACE] [AGGREGATE] FUNCTION [IF NOT EXISTS] function_name\n  RETURNS {STRING|INTEGER|REAL|DECIMAL}\n  SONAME shared_library_name\n\nDescription\n-----------\n\nA user-defined function (UDF) is a way to extend MariaDB with a new function\nthat works like a native (built-in) MariaDB function such as ABS() or CONCAT().\n\nfunction_name is the name that should be used in SQL statements to invoke the\nfunction.\n\nTo create a function, you must have the INSERT privilege for the mysql\ndatabase. This is necessary becauseCREATE FUNCTION adds a row to the\nmysql.func system table that records the function\'s name, type, and shared\nlibrary name. If you do not have this table, you should run the mysql_upgrade\ncommand to create it.\n\nUDFs need to be written in C, C++ or another language that uses C calling\nconventions, MariaDB needs to have been dynamically compiled, and your\noperating system must support dynamic loading.\n\nFor an example, see sql/udf_example.cc in the source tree. For a collection of\nexisting UDFs see http://www.mysqludf.org/.\n\nStatements making use of user-defined functions are not safe for replication.\n\nFor creating a stored function as opposed to a user-defined function, see\nCREATE FUNCTION.\n\nFor valid identifiers to use as function names, see Identifier Names.\n\nRETURNS\n-------\n\nThe RETURNS clause indicates the type of the function\'s return value, and can\nbe one of STRING, INTEGER, REAL or DECIMAL. DECIMAL functions currently return\nstring values and should be written like STRING functions.\n\nshared_library_name\n-------------------\n\nshared_library_name is the basename of the shared object file that contains\nthe code that implements the function. The file must be located in the plugin\ndirectory. This directory is given by the value of the plugin_dir system\nvariable. Note that before MariaDB/MySQL 5.1, the shared object could be\nlocated in any directory that was searched by your system\'s dynamic linker.\n\nAGGREGATE\n---------\n\nAggregate functions are summary functions such as SUM() and AVG().\n\nMariaDB starting with 10.4\n--------------------------\nAggregate UDF functions can be used as window functions.\n\nOR REPLACE\n----------\n\nMariaDB starting with 10.1.3\n----------------------------\nThe OR REPLACE clause was added in MariaDB 10.1.3\n\nIf the optional OR REPLACE clause is used, it acts as a shortcut for:\n\nDROP FUNCTION IF EXISTS function_name;\nCREATE FUNCTION name ...;\n\nIF NOT EXISTS\n-------------\n\nMariaDB starting with 10.1.3\n----------------------------\nThe IF NOT EXISTS clause was added in MariaDB 10.1.3\n\nWhen the IF NOT EXISTS clause is used, MariaDB will return a warning instead\nof an error if the specified function already exists. Cannot be used together\nwith OR REPLACE.\n\nUpgrading a UDF\n---------------\n\nTo upgrade the UDF\'s shared library, first run a DROP FUNCTION statement, then\nupgrade the shared library and finally run the CREATE FUNCTION statement. If\nyou upgrade without following this process, you may crash the server.\n\nExamples\n--------\n\nCREATE FUNCTION jsoncontains_path RETURNS integer SONAME \'ha_connect.so\';\nQuery OK, 0 rows affected (0.00 sec)\n\nOR REPLACE and IF NOT EXISTS:\n\nCREATE FUNCTION jsoncontains_path RETURNS integer SONAME \'ha_connect.so\';\nERROR 1125 (HY000): Function \'jsoncontains_path\' already exists\n\nCREATE OR REPLACE FUNCTION jsoncontains_path RETURNS integer SONAME\n\'ha_connect.so\';\nQuery OK, 0 rows affected (0.00 sec)\n\nCREATE FUNCTION IF NOT EXISTS jsoncontains_path RETURNS integer SONAME\n\'ha_connect.so\';\nQuery OK, 0 rows affected, 1 warning (0.00 sec)\n\nSHOW WARNINGS;\n+-------+------+---------------------------------------------+\n| Level | Code | Message                                     |\n+-------+------+---------------------------------------------+\n| Note  | 1125 | Function \'jsoncontains_path\' already exists |\n+-------+------+---------------------------------------------+\n\nURL: https://mariadb.com/kb/en/create-function-udf/','','https://mariadb.com/kb/en/create-function-udf/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (249,22,'DROP FUNCTION UDF','Syntax\n------\n\nDROP FUNCTION [IF EXISTS] function_name\n\nDescription\n-----------\n\nThis statement drops the user-defined function (UDF) named function_name.\n\nTo drop a function, you must have the DELETE privilege for the mysql database.\nThis is because DROP FUNCTION removes the row from the mysql.func system table\nthat records the function\'s name, type and shared library name.\n\nFor dropping a stored function, see DROP FUNCTION.\n\nUpgrading a UDF\n---------------\n\nTo upgrade the UDF\'s shared library, first run a DROP FUNCTION statement, then\nupgrade the shared library and finally run the CREATE FUNCTION statement. If\nyou upgrade without following this process, you may crash the server.\n\nExamples\n--------\n\nDROP FUNCTION jsoncontains_path;\n\nIF EXISTS:\n\nDROP FUNCTION jsoncontains_path;\nERROR 1305 (42000): FUNCTION test.jsoncontains_path does not exist\n\nDROP FUNCTION IF EXISTS jsoncontains_path;\nQuery OK, 0 rows affected, 1 warning (0.00 sec)\n\nSHOW WARNINGS;\n+-------+------+------------------------------------------------+\n| Level | Code | Message                                        |\n+-------+------+------------------------------------------------+\n| Note  | 1305 | FUNCTION test.jsoncontains_path does not exist |\n+-------+------+------------------------------------------------+\n\nURL: https://mariadb.com/kb/en/drop-function-udf/','','https://mariadb.com/kb/en/drop-function-udf/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (250,22,'Creating User-Defined Functions','User-defined functions allow MariaDB to be extended with a new function that\nworks like a native (built-in) MariaDB function such as ABS() or CONCAT().\nThere are alternative ways to add a new function: writing a native function\n(which requires modifying and compiling the server source code), or writing a\nstored function.\n\nStatements making use of user-defined functions are not safe for replication.\n\nFunctions are written in C or C++, and to make use of them, the operating\nsystem must support dynamic loading.\n\nEach new SQL function requires corresponding functions written in C/C++. In\nthe list below, at least the main function - x() - and one other, are\nrequired. x should be replaced by the name of the function you are creating.\n\nAll functions need to be thread-safe, so not global or static variables that\nchange can be allocated. Memory is allocated in x_init()/ and freed in\nx_deinit().\n\nSimple Functions\n----------------\n\nx()\n---\n\nRequired for all UDFs; this is where the results are calculated.\n\n+------------------------------------------+----------------------------------+\n| C/C++ type                               | SQL type                         |\n+------------------------------------------+----------------------------------+\n| char *                                   | STRING                           |\n+------------------------------------------+----------------------------------+\n| long long                                | INTEGER                          |\n+------------------------------------------+----------------------------------+\n| double                                   | REAL                             |\n+------------------------------------------+----------------------------------+\n\nDECIMAL functions return string values, and so should be written accordingly.\nIt is not possible to create ROW functions.\n\nx_init()\n--------\n\nInitialization function for x(). Can be used for the following:\n\n* Check the number of arguments to X() (the SQL equivalent).\n* Verify the argument types, or to force arguments to be of a particular type\nafter the function is called.\n* Specify whether the result can be NULL.\n* Specify the maximum result length.\n* For REAL functions, specify the maximum number of decimals for the result.\n* Allocate any required memory.\n\nx_deinit()\n----------\n\nDe-initialization function for x(). Used to de-allocate memory that was\nallocated in x_init().\n\nDescription\n-----------\n\nEach time the SQL function X() is called:\n\n* MariaDB will first call the C/C++ initialization function, x_init(),\nassuming it exists. All setup will be performed, and if it returns an error,\nthe SQL statement is aborted and no further functions are called.\n* If there is no x_init() function, or it has been called and did not return\nan error, x() is then called once per row.\n* After all rows have finished processing, x_deinit() is called, if present,\nto clean up by de-allocating any memory that was allocated in x_init().\n* See User-defined Functions Calling Sequences for more details on the\nfunctions.\n\nAggregate Functions\n-------------------\n\nThe following functions are required for aggregate functions, such as AVG()\nand SUM(). When using CREATE FUNCTION, the AGGREGATE keyword is required.\n\nx_clear()\n---------\n\nUsed to reset the current aggregate, but without inserting the argument as the\ninitial aggregate value for the new group.\n\nx_add()\n-------\n\nUsed to add the argument to the current aggregate.\n\nx_remove()\n----------\n\nStarting from MariaDB 10.4, improves the support of window functions (so it is\nnot obligatory to add it) and should remove the argument from the current\naggregate.\n\nDescription\n-----------\n\nEach time the aggregate SQL function X() is called:\n\n* MariaDB will first call the C/C++ initialization function, x_init(),\nassuming it exists. All setup will be performed, and if it returns an error,\nthe SQL statement is aborted and no further functions are called.\n* If there is no x_init() function, or it has been called and did not return\nan error, x() is then called once per row.\n* After all rows have finished processing, x_deinit() is called, if present,\nto clean up by de-allocating any memory that was allocated in x_init().\n\n* MariaDB will first call the C/C++ initialization function, x_init(),\nassuming it exists. All setup will be performed, and if it returns an error,\nthe SQL statement is aborted and no further functions are called.\n* The table is sorted according to the GROUP BY expression.\n* x_clear() is called for the first row of each new group.\n* x_add() is called once per row for each row in the same group.\n* x() is called when the group changes, or after the last row, to get the\naggregate result. \n* The latter three steps are repeated until all rows have been processed.\n* After all rows have finished processing, x_deinit() is called, if present,\nto clean up by de-allocating any memory that was allocated in x_init().\n\nExamples\n--------\n\nFor an example, see sql/udf_example.cc in the source tree. For a collection of\nexisting UDFs see https://github.com/mysqludf.\n\nURL: https://mariadb.com/kb/en/creating-user-defined-functions/','','https://mariadb.com/kb/en/creating-user-defined-functions/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (251,22,'User-Defined Functions Calling Sequences','The functions described in Creating User-defined Functions are expanded on\nthis page. They are declared as follows:\n\nSimple Functions\n----------------\n\nx()\n---\n\nIf x() returns an integer, it is declared as follows:\n\nlong long x(UDF_INIT *initid, UDF_ARGS *args,\n       char *is_null, char *error);\n\nIf x() returns a string (DECIMAL functions also return string values), it is\ndeclared as follows:\n\nchar *x(UDF_INIT *initid, UDF_ARGS *args,\n     char *result, unsigned long *length,\n     char *is_null, char *error);\n\nIf x() returns a real, it is declared as follows:\n\ndouble x(UDF_INIT *initid, UDF_ARGS *args,\n       char *is_null, char *error);\n\nx_init()\n--------\n\nmy_bool x_init(UDF_INIT *initid, UDF_ARGS *args, char *message);\n\nx_deinit()\n----------\n\nvoid x_deinit(UDF_INIT *initid);\n\nDescription\n-----------\n\ninitid is a parameter passed to all three functions that points to a UDF_INIT\nstructure, used for communicating information between the functions. Its\nstructure members are:\n\n* my_bool maybe_null\nmaybe_null should be set to 1 if x_init can return a NULL value, Defaults to 1\nif any arguments are declared maybe_null.\n\n* unsigned int decimals\nNumber of decimals after the decimal point. The default, if an explicit number\nof decimals is passed in the arguments to the main function, is the maximum\nnumber of decimals, so if 9.5, 9.55 and 9.555 are passed to the function, the\ndefault would be three (based on 9.555, the maximum).  If there are no\nexplicit number of decimals, the default is set to 31, or one more than the\nmaximum for the DOUBLE, FLOAT and DECIMAL types. This default can be changed\nin the function to suit the actual calculation.\n\n* unsigned int max_length\nMaximum length of the result. For integers, the default is 21. For strings,\nthe length of the longest argument. For reals, the default is 13 plus the\nnumber of decimals indicated by initid->decimals. The length includes any\nsigns or decimal points. Can also be set to 65KB or 16MB in order to return a\nBLOB. The memory remains unallocated, but this is used to decide on the data\ntype to use if the data needs to be temporarily stored.\n\n* char *ptr\nA pointer for use as required by the function. Commonly, initid->ptr is used\nto communicate allocated memory, with x_init() allocating the memory and\nassigning it to this pointer, x() using it, and x_deinit() de-allocating it.\n\n* my_bool const_item\nShould be set to 1 in x_init() if x() always returns the same value, otherwise\n0.\n\nAggregate Functions\n-------------------\n\nx_clear()\n---------\n\nx_clear() is a required function for aggregate functions, and is declared as\nfollows:\n\nvoid x_clear(UDF_INIT *initid, char *is_null, char *error);\n\nIt is called when the summary results need to be reset, that is at the\nbeginning of each new group. but also to reset the values when there were no\nmatching rows.\n\nis_null is set to point to CHAR(0) before calling x_clear().\n\nIn the case of an error, you can store the value to which the error argument\npoints (a single-byte variable, not a string string buffer) in the variable.\n\nx_reset()\n---------\n\nx_reset() is declared as follows:\n\nvoid x_reset(UDF_INIT *initid, UDF_ARGS *args,\n       char *is_null, char *error);\n\nIt is called on finding the first row in a new group. Should reset the summary\nvariables, and then use UDF_ARGS as the first value in the group\'s internal\nsummary value. The function is not required if the UDF interface uses\nx_clear().\n\nx_add()\n-------\n\nx_add() is declared as follows:\n\nvoid x_add(UDF_INIT *initid, UDF_ARGS *args,\n      char *is_null, char *error);\n\nIt is called for all rows belonging to the same group, and should be used to\nadd the value in UDF_ARGS to the internal summary variable.\n\nx_remove()\n----------\n\nx_remove() was added in MariaDB 10.4 and is declared as follows (same as\nx_add()):\n\nvoid x_remove(UDF_INIT* initid, UDF_ARGS* args,\n       char* is_null, char *error );\n\nIt adds more efficient support of aggregate UDFs as window functions.\nx_remove() should \"subtract\" the row (reverse x_add()). In MariaDB 10.4\naggregate UDFs will work as WINDOW functions without x_remove() but it will\nnot be so efficient.\n\nIf x_remove() supported (defined) detected automatically.\n\nURL: https://mariadb.com/kb/en/user-defined-functions-calling-sequences/','','https://mariadb.com/kb/en/user-defined-functions-calling-sequences/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (252,22,'User-Defined Functions Security','The MariaDB server imposes a number of limitations on user-defined functions\nfor security purposes.\n\n* The INSERT privilege for the mysql database is required to run CREATE\nFUNCTION, as a record will be added to the mysql.func-table.\n* The DELETE privilege for the mysql database is required to run DROP FUNCTION\nas the corresponding record will be removed from the mysql.func-table.\n* UDF object files can only be placed in the plugin directory, as specified by\nthe value of the plugin_dir system variable.\n* At least one symbol, beyond the required x() - corresponding to an SQL\nfunction X()) - is required. These can be x_init(), x_deinit(), xxx_reset(),\nx_clear() and x_add() functions (see Creating User-defined Functions). The\nallow-suspicious-udfs mysqld option (by default unset) provides a workaround,\npermitting only one symbol to be used. This is not recommended, as it opens\nthe possibility of loading shared objects that are not legitimate user-defined\nfunctions.\n\nURL: https://mariadb.com/kb/en/user-defined-functions-security/','','https://mariadb.com/kb/en/user-defined-functions-security/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (253,23,'Numeric Data Type Overview','There are a number of numeric data types:\n\n* TINYINT\n* BOOLEAN - Synonym for TINYINT(1)\n* INT1 - Synonym for TINYINT\n* SMALLINT\n* INT2 - Synonym for SMALLINT\n* MEDIUMINT\n* INT3 - Synonym for MEDIUMINT\n* INT, INTEGER\n* INT4 - Synonym for INT\n* BIGINT\n* INT8 - Synonym for BIGINT\n* DECIMAL, DEC, NUMERIC, FIXED\n* FLOAT\n* DOUBLE, DOUBLE PRECISION, REAL\n* BIT\n\nSee the specific articles for detailed information on each.\n\nSIGNED, UNSIGNED and ZEROFILL\n-----------------------------\n\nMost numeric types can be defined as SIGNED, UNSIGNED or ZEROFILL, for example:\n\nTINYINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nIf SIGNED, or no attribute, is specified, a portion of the numeric type will\nbe reserved for the sign (plus or minus). For example, a TINYINT SIGNED can\nrange from -128 to 127.\n\nIf UNSIGNED is specified, no portion of the numeric type is reserved for the\nsign, so for integer types range can be larger. For example, a TINYINT\nUNSIGNED can range from 0 to 255. Floating point and fixed-point types also\ncan be UNSIGNED, but this only prevents negative values from being stored and\ndoesn\'t alter the range.\n\nIf ZEROFILL is specified, the column will be set to UNSIGNED and the spaces\nused by default to pad the field are replaced with zeros. ZEROFILL is ignored\nin expressions or as part of a UNION. ZEROFILL is a non-standard MySQL and\nMariaDB enhancement.\n\nNote that although the preferred syntax indicates that the attributes are\nexclusive, more than one attribute can be specified.\n\nUntil MariaDB 10.2.7 (MDEV-8659), any combination of the attributes could be\nused in any order, with duplicates. In this case:\n\n* the presence of ZEROFILL makes the column UNSIGNED ZEROFILL.\n* the presence of UNSIGNED makes the column UNSIGNED.\n\nFrom MariaDB 10.2.8, only the following combinations are supported:\n\n* SIGNED\n* UNSIGNED\n* ZEROFILL\n* UNSIGNED ZEROFILL\n* ZEROFILL UNSIGNED\n\nThe latter two should be replaced with simply ZEROFILL, but are still accepted\nby the parser.\n\nExamples\n--------\n\nCREATE TABLE zf (\n i1 TINYINT SIGNED,\n i2 TINYINT UNSIGNED,\n i3 TINYINT ZEROFILL\n);\n\nINSERT INTO zf VALUES (2,2,2);\n\nSELECT * FROM zf;\n+------+------+------+\n| i1   | i2   | i3   |\n+------+------+------+\n|    2 |    2 |  002 |\n+------+------+------+\n\nRange\n-----\n\nWhen attempting to add a value that is out of the valid range for the numeric\ntype, MariaDB will react depending on the strict SQL_MODE setting.\n\nIf strict_mode has been set (the default from MariaDB 10.2.4), MariaDB will\nreturn an error.\n\nIf strict_mode has not been set (the default until MariaDB 10.2.3), MariaDB\nwill adjust the number to fit in the field, returning a warning.\n\nExamples\n--------\n\nWith strict_mode set:\n\nSHOW VARIABLES LIKE \'sql_mode\';\n+---------------+--------------------------------------------------------------\n----------------------------+\n| Variable_name | Value                                                       \n              |\n+---------------+--------------------------------------------------------------\n----------------------------+\n| sql_mode      |\nSTRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SU\nSTITUTION |\n+---------------+--------------------------------------------------------------\n----------------------------+\n\nCREATE TABLE ranges (i1 TINYINT, i2 SMALLINT, i3 TINYINT UNSIGNED);\n\nINSERT INTO ranges VALUES (257,257,257);\nERROR 1264 (22003): Out of range value for column \'i1\' at row 1\n\nSELECT * FROM ranges;\nEmpty set (0.10 sec)\n\nWith strict_mode unset:\n\nSHOW VARIABLES LIKE \'sql_mode%\';\n+---------------+-------+\n| Variable_name | Value |\n+---------------+-------+\n| sql_mode      |       |\n+---------------+-------+\n\nCREATE TABLE ranges (i1 TINYINT, i2 SMALLINT, i3 TINYINT UNSIGNED);\n\nINSERT INTO ranges VALUES (257,257,257);\nQuery OK, 1 row affected, 2 warnings (0.00 sec)\n\nSHOW WARNINGS;\n+---------+------+---------------------------------------------+\n| Level   | Code | Message                                     |\n+---------+------+---------------------------------------------+\n| Warning | 1264 | Out of range value for column \'i1\' at row 1 |\n| Warning | 1264 | Out of range value for column \'i3\' at row 1 |\n+---------+------+---------------------------------------------+\n2 rows in set (0.00 sec)\n\nSELECT * FROM ranges;\n+------+------+------+\n| i1   | i2   | i3   |\n+------+------+------+\n|  127 |  257 |  255 |\n+------+------+------+\n\nAuto_increment\n--------------\n\nThe AUTO_INCREMENT attribute can be used to generate a unique identity for new\nrows. For more details, see auto_increment.\n\nURL: https://mariadb.com/kb/en/numeric-data-type-overview/','','https://mariadb.com/kb/en/numeric-data-type-overview/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (254,23,'TINYINT','Syntax\n------\n\nTINYINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA very small integer. The signed range is -128 to 127. The unsigned range is 0\nto 255. For details on the attributes, see Numeric Data Type Overview.\n\nINT1 is a synonym for TINYINT. BOOL and BOOLEAN are synonyms for TINYINT(1).\n\nExamples\n--------\n\nCREATE TABLE tinyints (a TINYINT,b TINYINT UNSIGNED,c TINYINT ZEROFILL);\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO tinyints VALUES (-10,-10,-10);\nERROR 1264 (22003): Out of range value for column \'b\' at row 1\n\nINSERT INTO tinyints VALUES (-10,10,-10);\nERROR 1264 (22003): Out of range value for column \'c\' at row 1\n\nINSERT INTO tinyints VALUES (-10,10,10);\n\nSELECT * FROM tinyints;\n+------+------+------+\n| a    | b    | c    |\n+------+------+------+\n|  -10 |   10 |  010 |\n+------+------+------+\n\nINSERT INTO tinyints VALUES (128,128,128);\nERROR 1264 (22003): Out of range value for column \'a\' at row 1\n\nINSERT INTO tinyints VALUES (127,128,128);\n\nSELECT * FROM tinyints;\n+------+------+------+\n| a    | b    | c    |\n+------+------+------+\n|  -10 |   10 |  010 |\n|  127 |  128 |  128 |\n+------+------+------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO tinyints VALUES (-10,-10,-10);\nQuery OK, 1 row affected, 2 warnings (0.08 sec)\nWarning (Code 1264): Out of range value for column \'b\' at row 1\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO tinyints VALUES (-10,10,-10);\nQuery OK, 1 row affected, 1 warning (0.11 sec)\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO tinyints VALUES (-10,10,10);\n\nSELECT * FROM tinyints;\n+------+------+------+\n| a    | b    | c    |\n+------+------+------+\n|  -10 |    0 |  000 |\n|  -10 |   10 |  000 |\n|  -10 |   10 |  010 |\n+------+------+------+\n\nINSERT INTO tinyints VALUES (128,128,128);\nQuery OK, 1 row affected, 1 warning (0.19 sec)\nWarning (Code 1264): Out of range value for column \'a\' at row 1\n\nINSERT INTO tinyints VALUES (127,128,128);\n\nSELECT * FROM tinyints;\n+------+------+------+\n| a    | b    | c    |\n+------+------+------+\n|  -10 |    0 |  000 |\n|  -10 |   10 |  000 |\n|  -10 |   10 |  010 |\n|  127 |  128 |  128 |\n|  127 |  128 |  128 |\n+------+------+------+\n\nURL: https://mariadb.com/kb/en/tinyint/','','https://mariadb.com/kb/en/tinyint/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (255,23,'BOOLEAN','Syntax\n------\n\nBOOL, BOOLEAN\n\nDescription\n-----------\n\nThese types are synonyms for TINYINT(1). A value of zero is considered false.\nNon-zero values are considered true.\n\nHowever, the values TRUE and FALSE are merely aliases for 1 and 0. See Boolean\nLiterals, as well as the IS operator for testing values against a boolean.\n\nExamples\n--------\n\nCREATE TABLE boo (i BOOLEAN);\n\nDESC boo;\n+-------+------------+------+-----+---------+-------+\n| Field | Type       | Null | Key | Default | Extra |\n+-------+------------+------+-----+---------+-------+\n| i     | tinyint(1) | YES  |     | NULL    |       |\n+-------+------------+------+-----+---------+-------+\n\nSELECT IF(0, \'true\', \'false\');\n+------------------------+\n| IF(0, \'true\', \'false\') |\n+------------------------+\n| false                  |\n+------------------------+\n\nSELECT IF(1, \'true\', \'false\');\n+------------------------+\n| IF(1, \'true\', \'false\') |\n+------------------------+\n| true                   |\n+------------------------+\n\nSELECT IF(2, \'true\', \'false\');\n+------------------------+\n| IF(2, \'true\', \'false\') |\n+------------------------+\n| true                   |\n+------------------------+\n\nTRUE and FALSE as aliases for 1 and 0:\n\nSELECT IF(0 = FALSE, \'true\', \'false\');\n\n+--------------------------------+\n| IF(0 = FALSE, \'true\', \'false\') |\n+--------------------------------+\n| true                           |\n+--------------------------------+\n\nSELECT IF(1 = TRUE, \'true\', \'false\');\n+-------------------------------+\n| IF(1 = TRUE, \'true\', \'false\') |\n+-------------------------------+\n| true                          |\n+-------------------------------+\n\nSELECT IF(2 = TRUE, \'true\', \'false\');\n+-------------------------------+\n| IF(2 = TRUE, \'true\', \'false\') |\n+-------------------------------+\n| false                         |\n+-------------------------------+\n\nSELECT IF(2 = FALSE, \'true\', \'false\');\n+--------------------------------+\n| IF(2 = FALSE, \'true\', \'false\') |\n+--------------------------------+\n| false                          |\n+--------------------------------+\n\nThe last two statements display the results shown because 2 is equal to\nneither 1 nor 0.\n\nURL: https://mariadb.com/kb/en/boolean/','','https://mariadb.com/kb/en/boolean/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (256,23,'SMALLINT','Syntax\n------\n\nSMALLINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA small integer. The signed range is -32768 to 32767. The unsigned range is 0\nto 65535.\n\nIf a column has been set to ZEROFILL, all values will be prepended by zeros so\nthat the SMALLINT value contains a number of M digits.\n\nNote: If the ZEROFILL attribute has been specified, the column will\nautomatically become UNSIGNED.\n\nINT2 is a synonym for SMALLINT.\n\nFor more details on the attributes, see Numeric Data Type Overview.\n\nExamples\n--------\n\nCREATE TABLE smallints (a SMALLINT,b SMALLINT UNSIGNED,c SMALLINT ZEROFILL);\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO smallints VALUES (-10,-10,-10);\nERROR 1264 (22003): Out of range value for column \'b\' at row 1\n\nINSERT INTO smallints VALUES (-10,10,-10);\nERROR 1264 (22003): Out of range value for column \'c\' at row 1\n\nINSERT INTO smallints VALUES (-10,10,10);\n\nINSERT INTO smallints VALUES (32768,32768,32768);\nERROR 1264 (22003): Out of range value for column \'a\' at row 1\n\nINSERT INTO smallints VALUES (32767,32768,32768);\n\nSELECT * FROM smallints;\n+-------+-------+-------+\n| a     | b     | c     |\n+-------+-------+-------+\n|   -10 |    10 | 00010 |\n| 32767 | 32768 | 32768 |\n+-------+-------+-------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO smallints VALUES (-10,-10,-10);\nQuery OK, 1 row affected, 2 warnings (0.09 sec)\nWarning (Code 1264): Out of range value for column \'b\' at row 1\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO smallints VALUES (-10,10,-10);\nQuery OK, 1 row affected, 1 warning (0.08 sec)\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO smallints VALUES (-10,10,10);\n\nINSERT INTO smallints VALUES (32768,32768,32768);\nQuery OK, 1 row affected, 1 warning (0.04 sec)\nWarning (Code 1264): Out of range value for column \'a\' at row 1\n\nINSERT INTO smallints VALUES (32767,32768,32768);\n\nSELECT * FROM smallints;\n+-------+-------+-------+\n| a     | b     | c     |\n+-------+-------+-------+\n|   -10 |     0 | 00000 |\n|   -10 |    10 | 00000 |\n|   -10 |    10 | 00010 |\n| 32767 | 32768 | 32768 |\n| 32767 | 32768 | 32768 |\n+-------+-------+-------+\n\nURL: https://mariadb.com/kb/en/smallint/','','https://mariadb.com/kb/en/smallint/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (257,23,'MEDIUMINT','Syntax\n------\n\nMEDIUMINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA medium-sized integer. The signed range is -8388608 to 8388607. The unsigned\nrange is 0 to 16777215.\n\nZEROFILL pads the integer with zeroes and assumes UNSIGNED (even if UNSIGNED\nis not specified).\n\nINT3 is a synonym for MEDIUMINT.\n\nFor details on the attributes, see Numeric Data Type Overview.\n\nExamples\n--------\n\nCREATE TABLE mediumints (a MEDIUMINT,b MEDIUMINT UNSIGNED,c MEDIUMINT\nZEROFILL);\n\nDESCRIBE mediumints;\n+-------+--------------------------------+------+-----+---------+-------+\n| Field | Type                           | Null | Key | Default | Extra |\n+-------+--------------------------------+------+-----+---------+-------+\n| a     | mediumint(9)                   | YES  |     | NULL    |       |\n| b     | mediumint(8) unsigned          | YES  |     | NULL    |       |\n| c     | mediumint(8) unsigned zerofill | YES  |     | NULL    |       |\n+-------+--------------------------------+------+-----+---------+-------+\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO mediumints VALUES (-10,-10,-10);\nERROR 1264 (22003): Out of range value for column \'b\' at row 1\n\nINSERT INTO mediumints VALUES (-10,10,-10);\nERROR 1264 (22003): Out of range value for column \'c\' at row 1\n\nINSERT INTO mediumints VALUES (-10,10,10);\n\nINSERT INTO mediumints VALUES (8388608,8388608,8388608);\nERROR 1264 (22003): Out of range value for column \'a\' at row 1\n\nINSERT INTO mediumints VALUES (8388607,8388608,8388608);\n\nSELECT * FROM mediumints;\n+---------+---------+----------+\n| a       | b       | c        |\n+---------+---------+----------+\n|     -10 |      10 | 00000010 |\n| 8388607 | 8388608 | 08388608 |\n+---------+---------+----------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO mediumints VALUES (-10,-10,-10);\nQuery OK, 1 row affected, 2 warnings (0.05 sec)\nWarning (Code 1264): Out of range value for column \'b\' at row 1\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO mediumints VALUES (-10,10,-10);\nQuery OK, 1 row affected, 1 warning (0.08 sec)\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO mediumints VALUES (-10,10,10);\n\nINSERT INTO mediumints VALUES (8388608,8388608,8388608);\nQuery OK, 1 row affected, 1 warning (0.05 sec)\nWarning (Code 1264): Out of range value for column \'a\' at row 1\n\nINSERT INTO mediumints VALUES (8388607,8388608,8388608);\n\nSELECT * FROM mediumints;\n+---------+---------+----------+\n| a       | b       | c        |\n+---------+---------+----------+\n|     -10 |       0 | 00000000 |\n|     -10 |       0 | 00000000 |\n|     -10 |      10 | 00000000 |\n|     -10 |      10 | 00000010 |\n| 8388607 | 8388608 | 08388608 |\n| 8388607 | 8388608 | 08388608 |\n+---------+---------+----------+\n\nURL: https://mariadb.com/kb/en/mediumint/','','https://mariadb.com/kb/en/mediumint/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (258,23,'INT','Syntax\n------\n\nINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\nINTEGER[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA normal-size integer. When marked UNSIGNED, it ranges from 0 to 4294967295,\notherwise its range is -2147483648 to 2147483647 (SIGNED is the default). If a\ncolumn has been set to ZEROFILL, all values will be prepended by zeros so that\nthe INT value contains a number of M digits. INTEGER is a synonym for INT.\n\nNote: If the ZEROFILL attribute has been specified, the column will\nautomatically become UNSIGNED.\n\nINT4 is a synonym for INT.\n\nFor details on the attributes, see Numeric Data Type Overview.\n\nExamples\n--------\n\nCREATE TABLE ints (a INT,b INT UNSIGNED,c INT ZEROFILL);\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO ints VALUES (-10,-10,-10);\nERROR 1264 (22003): Out of range value for column \'b\' at row 1\n\nINSERT INTO ints VALUES (-10,10,-10);\nERROR 1264 (22003): Out of range value for column \'c\' at row 1\n\nINSERT INTO ints VALUES (-10,10,10);\n\nINSERT INTO ints VALUES (2147483648,2147483648,2147483648);\nERROR 1264 (22003): Out of range value for column \'a\' at row 1\n\nINSERT INTO ints VALUES (2147483647,2147483648,2147483648);\n\nSELECT * FROM ints;\n+------------+------------+------------+\n| a          | b          | c          |\n+------------+------------+------------+\n|        -10 |         10 | 0000000010 |\n| 2147483647 | 2147483648 | 2147483648 |\n+------------+------------+------------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO ints VALUES (-10,-10,-10);\nQuery OK, 1 row affected, 2 warnings (0.10 sec)\nWarning (Code 1264): Out of range value for column \'b\' at row 1\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO ints VALUES (-10,10,-10);\nQuery OK, 1 row affected, 1 warning (0.08 sec)\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO ints VALUES (-10,10,10);\n\nINSERT INTO ints VALUES (2147483648,2147483648,2147483648);\nQuery OK, 1 row affected, 1 warning (0.07 sec)\nWarning (Code 1264): Out of range value for column \'a\' at row 1\n\nINSERT INTO ints VALUES (2147483647,2147483648,2147483648);\n\nSELECT * FROM ints;\n+------------+------------+------------+\n| a          | b          | c          |\n+------------+------------+------------+\n|        -10 |          0 | 0000000000 |\n|        -10 |         10 | 0000000000 |\n|        -10 |         10 | 0000000010 |\n| 2147483647 | 2147483648 | 2147483648 |\n| 2147483647 | 2147483648 | 2147483648 |\n+------------+------------+------------+\n\nURL: https://mariadb.com/kb/en/int/','','https://mariadb.com/kb/en/int/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (259,23,'BIGINT','Syntax\n------\n\nBIGINT[(M)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA large integer. The signed range is -9223372036854775808 to\n9223372036854775807. The unsigned range is 0 to 18446744073709551615.\n\nIf a column has been set to ZEROFILL, all values will be prepended by zeros so\nthat the BIGINT value contains a number of M digits.\n\nNote: If the ZEROFILL attribute has been specified, the column will\nautomatically become UNSIGNED.\n\nFor more details on the attributes, see Numeric Data Type Overview.\n\nSERIAL is an alias for:\n\nBIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE\n\nINT8 is a synonym for BIGINT.\n\nExamples\n--------\n\nCREATE TABLE bigints (a BIGINT,b BIGINT UNSIGNED,c BIGINT ZEROFILL);\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO bigints VALUES (-10,-10,-10);\nERROR 1264 (22003): Out of range value for column \'b\' at row 1\n\nINSERT INTO bigints VALUES (-10,10,-10);\nERROR 1264 (22003): Out of range value for column \'c\' at row 1\n\nINSERT INTO bigints VALUES (-10,10,10);\n\nINSERT INTO bigints VALUES\n(9223372036854775808,9223372036854775808,9223372036854775808);\nERROR 1264 (22003): Out of range value for column \'a\' at row 1\n\nINSERT INTO bigints VALUES\n(9223372036854775807,9223372036854775808,9223372036854775808);\n\nSELECT * FROM bigints;\n+---------------------+---------------------+----------------------+\n| a                   | b                   | c                    |\n+---------------------+---------------------+----------------------+\n|                 -10 |                  10 | 00000000000000000010 |\n| 9223372036854775807 | 9223372036854775808 | 09223372036854775808 |\n+---------------------+---------------------+----------------------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO bigints VALUES (-10,-10,-10);\nQuery OK, 1 row affected, 2 warnings (0.08 sec)\nWarning (Code 1264): Out of range value for column \'b\' at row 1\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO bigints VALUES (-10,10,-10);\nQuery OK, 1 row affected, 1 warning (0.08 sec)\nWarning (Code 1264): Out of range value for column \'c\' at row 1\n\nINSERT INTO bigints VALUES (-10,10,10);\n\nINSERT INTO bigints VALUES\n(9223372036854775808,9223372036854775808,9223372036854775808);\nQuery OK, 1 row affected, 1 warning (0.07 sec)\nWarning (Code 1264): Out of range value for column \'a\' at row 1\n\nINSERT INTO bigints VALUES\n(9223372036854775807,9223372036854775808,9223372036854775808);\n\nSELECT * FROM bigints;\n+---------------------+---------------------+----------------------+\n| a                   | b                   | c                    |\n+---------------------+---------------------+----------------------+\n|                 -10 |                   0 | 00000000000000000000 |\n|                 -10 |                  10 | 00000000000000000000 |\n|                 -10 |                  10 | 00000000000000000010 |\n| 9223372036854775807 | 9223372036854775808 | 09223372036854775808 |\n| 9223372036854775807 | 9223372036854775808 | 09223372036854775808 |\n+---------------------+---------------------+----------------------+\n\nURL: https://mariadb.com/kb/en/bigint/','','https://mariadb.com/kb/en/bigint/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (260,23,'DECIMAL','Syntax\n------\n\nDECIMAL[(M[,D])] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA packed \"exact\" fixed-point number. M is the total number of digits (the\nprecision) and D is the number of digits after the decimal point (the scale).\n\n* The decimal point and (for negative numbers) the \"-\" sign are not\ncounted in M. \n* If D is 0, values have no decimal point or fractional\npart and on INSERT the value will be rounded to the nearest DECIMAL. \n* The maximum number of digits (M) for DECIMAL is 65. \n* The maximum number of supported decimals (D) is 30 before MariadB 10.2.1 and\n38 afterwards. \n* If D is omitted, the default is 0. If M is omitted, the default is 10.\n\nUNSIGNED, if specified, disallows negative values.\n\nZEROFILL, if specified, pads the number with zeros, up to the total number of\ndigits specified by M.\n\nAll basic calculations (+, -, *, /) with DECIMAL columns are done with a\nprecision of 65 digits.\n\nFor more details on the attributes, see Numeric Data Type Overview.\n\nDEC, NUMERIC and FIXED are synonyms, as well as NUMBER in Oracle mode from\nMariaDB 10.3.\n\nExamples\n--------\n\nCREATE TABLE t1 (d DECIMAL UNSIGNED ZEROFILL);\n\nINSERT INTO t1 VALUES (1),(2),(3),(4.0),(5.2),(5.7);\nQuery OK, 6 rows affected, 2 warnings (0.16 sec)\nRecords: 6  Duplicates: 0  Warnings: 2\n\nNote (Code 1265): Data truncated for column \'d\' at row 5\nNote (Code 1265): Data truncated for column \'d\' at row 6\n\nSELECT * FROM t1;\n+------------+\n| d          |\n+------------+\n| 0000000001 |\n| 0000000002 |\n| 0000000003 |\n| 0000000004 |\n| 0000000005 |\n| 0000000006 |\n+------------+\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO t1 VALUES (-7);\nERROR 1264 (22003): Out of range value for column \'d\' at row 1\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO t1 VALUES (-7);\nQuery OK, 1 row affected, 1 warning (0.02 sec)\nWarning (Code 1264): Out of range value for column \'d\' at row 1\n\nSELECT * FROM t1;\n+------------+\n| d          |\n+------------+\n| 0000000001 |\n| 0000000002 |\n| 0000000003 |\n| 0000000004 |\n| 0000000005 |\n| 0000000006 |\n| 0000000000 |\n+------------+\n\nURL: https://mariadb.com/kb/en/decimal/','','https://mariadb.com/kb/en/decimal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (261,23,'FLOAT','Syntax\n------\n\nFLOAT[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA small (single-precision) floating-point number (see DOUBLE for a\nregular-size floating point number). Allowable values are:\n\n* -3.402823466E+38 to -1.175494351E-38\n* 0\n* 1.175494351E-38 to 3.402823466E+38.\n\nThese are the theoretical limits, based on the IEEE standard. The actual range\nmight be slightly smaller depending on your hardware or operating system.\n\nM is the total number of digits and D is the number of digits following the\ndecimal point. If M and D are omitted, values are stored to the limits allowed\nby the hardware. A single-precision floating-point number is accurate to\napproximately 7 decimal places.\n\nUNSIGNED, if specified, disallows negative values.\n\nUsing FLOAT might give you some unexpected problems because all calculations\nin MariaDB are done with double precision. See Floating Point Accuracy.\n\nFor more details on the attributes, see Numeric Data Type Overview.\n\nURL: https://mariadb.com/kb/en/float/','','https://mariadb.com/kb/en/float/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (262,23,'DOUBLE','Syntax\n------\n\nDOUBLE[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]\nDOUBLE PRECISION[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]\nREAL[(M,D)] [SIGNED | UNSIGNED | ZEROFILL]\n\nDescription\n-----------\n\nA normal-size (double-precision) floating-point number (see FLOAT for a\nsingle-precision floating-point number).\n\nAllowable values are:\n\n* -1.7976931348623157E+308 to -2.2250738585072014E-308\n* 0\n* 2.2250738585072014E-308 to 1.7976931348623157E+308\n\nThese are the theoretical limits, based on the IEEE standard. The actual range\nmight be slightly smaller depending on your hardware or operating system.\n\nM is the total number of digits and D is the number of digits following the\ndecimal point. If M and D are omitted, values are stored to the limits allowed\nby the hardware. A double-precision floating-point number is accurate to\napproximately 15 decimal places.\n\nUNSIGNED, if specified, disallows negative values.\n\nZEROFILL, if specified, pads the number with zeros, up to the total number of\ndigits specified by M.\n\nREAL and DOUBLE PRECISION are synonyms, unless the REAL_AS_FLOAT SQL mode is\nenabled, in which case REAL is a synonym for FLOAT rather than DOUBLE.\n\nSee Floating Point Accuracy for issues when using floating-point numbers.\n\nFor more details on the attributes, see Numeric Data Type Overview.\n\nExamples\n--------\n\nCREATE TABLE t1 (d DOUBLE(5,0) zerofill);\n\nINSERT INTO t1 VALUES (1),(2),(3),(4);\n\nSELECT * FROM t1;\n+-------+\n| d     |\n+-------+\n| 00001 |\n| 00002 |\n| 00003 |\n| 00004 |\n+-------+\n\nURL: https://mariadb.com/kb/en/double/','','https://mariadb.com/kb/en/double/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (263,23,'BIT','Syntax\n------\n\nBIT[(M)]\n\nDescription\n-----------\n\nA bit-field type. M indicates the number of bits per value, from 1 to 64. The\ndefault is 1 if M is omitted.\n\nBit values can be inserted with b\'value\' notation, where value is the bit\nvalue in 0\'s and 1\'s.\n\nBit fields are automatically zero-padded from the left to the full length of\nthe bit, so for example in a BIT(4) field, \'10\' is equivalent to \'0010\'.\n\nBits are returned as binary, so to display them, either add 0, or use a\nfunction such as HEX, OCT or BIN to convert them.\n\nExamples\n--------\n\nCREATE TABLE b ( b1 BIT(8) );\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nINSERT INTO b VALUES (b\'11111111\');\n\nINSERT INTO b VALUES (b\'01010101\');\n\nINSERT INTO b VALUES (b\'1111111111111\');\nERROR 1406 (22001): Data too long for column \'b1\' at row 1\n\nSELECT b1+0, HEX(b1), OCT(b1), BIN(b1) FROM b;\n+------+---------+---------+----------+\n| b1+0 | HEX(b1) | OCT(b1) | BIN(b1)  |\n+------+---------+---------+----------+\n|  255 | FF      | 377     | 11111111 |\n|   85 | 55      | 125     | 1010101  |\n+------+---------+---------+----------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nINSERT INTO b VALUES (b\'11111111\'),(b\'01010101\'),(b\'1111111111111\');\nQuery OK, 3 rows affected, 1 warning (0.10 sec)\nRecords: 3  Duplicates: 0  Warnings: 1\n\nSHOW WARNINGS;\n+---------+------+---------------------------------------------+\n| Level   | Code | Message                                     |\n+---------+------+---------------------------------------------+\n| Warning | 1264 | Out of range value for column \'b1\' at row 3 |\n+---------+------+---------------------------------------------+\n\nSELECT b1+0, HEX(b1), OCT(b1), BIN(b1) FROM b;\n+------+---------+---------+----------+\n| b1+0 | HEX(b1) | OCT(b1) | BIN(b1)  |\n+------+---------+---------+----------+\n|  255 | FF      | 377     | 11111111 |\n|   85 | 55      | 125     | 1010101  |\n|  255 | FF      | 377     | 11111111 |\n+------+---------+---------+----------+\n\nURL: https://mariadb.com/kb/en/bit/','','https://mariadb.com/kb/en/bit/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (264,23,'Floating-point Accuracy','Due to their nature, not all floating-point numbers can be stored with exact\nprecision. Hardware architecture, the CPU or even the compiler version and\noptimization level may affect the precision.\n\nIf you are comparing DOUBLEs or FLOATs with numeric decimals, it is not safe\nto use the equality operator.\n\nSometimes, changing a floating-point number from single-precision (FLOAT) to\ndouble-precision (DOUBLE) will fix the problem.\n\nExample\n-------\n\nf1, f2 and f3 have seemingly identical values across each row, but due to\nfloating point accuracy, the results may be unexpected.\n\nCREATE TABLE fpn (id INT, f1 FLOAT, f2 DOUBLE, f3 DECIMAL (10,3));\nINSERT INTO fpn VALUES (1,2,2,2),(2,0.1,0.1,0.1);\n\nSELECT * FROM fpn WHERE f1*f1 = f2*f2;\n+------+------+------+-------+\n| id   | f1   | f2   | f3    |\n+------+------+------+-------+\n|    1 |    2 |    2 | 2.000 |\n+------+------+------+-------+\n\nThe reason why only one instead of two rows was returned becomes clear when we\nsee how the floating point squares were evaluated.\n\nSELECT f1*f1, f2*f2, f3*f3 FROM fpn;\n+----------------------+----------------------+----------+\n| f1*f1                | f2*f2                | f3*f3    |\n+----------------------+----------------------+----------+\n|                    4 |                    4 | 4.000000 |\n| 0.010000000298023226 | 0.010000000000000002 | 0.010000 |\n+----------------------+----------------------+----------+\n\nURL: https://mariadb.com/kb/en/floating-point-accuracy/','','https://mariadb.com/kb/en/floating-point-accuracy/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (265,23,'BINARY','This page describes the BINARY data type. For details about the operator, see\nBinary Operator.\n\nSyntax\n------\n\nBINARY(M)\n\nDescription\n-----------\n\nThe BINARY type is similar to the CHAR type, but stores binary byte strings\nrather than non-binary character strings. M represents the column length in\nbytes.\n\nIt contains no character set, and comparison and sorting are based on the\nnumeric value of the bytes.\n\nIf the maximum length is exceeded, and SQL strict mode is not enabled , the\nextra characters will be dropped with a warning. If strict mode is enabled, an\nerror will occur.\n\nBINARY values are right-padded with 0x00 (the zero byte) to the specified\nlength when inserted. The padding is not removed on select, so this needs to\nbe taken into account when sorting and comparing, where all bytes are\nsignificant. The zero byte, 0x00 is less than a space for comparison purposes.\n\nExamples\n--------\n\nInserting too many characters, first with strict mode off, then with it on:\n\nCREATE TABLE bins (a BINARY(10));\n\nINSERT INTO bins VALUES(\'12345678901\');\nQuery OK, 1 row affected, 1 warning (0.04 sec)\n\nSELECT * FROM bins;\n+------------+\n| a          |\n+------------+\n| 1234567890 |\n+------------+\n\nSET sql_mode=\'STRICT_ALL_TABLES\';\n\nINSERT INTO bins VALUES(\'12345678901\');\nERROR 1406 (22001): Data too long for column \'a\' at row 1\n\nSorting is performed with the byte value:\n\nTRUNCATE bins;\n\nINSERT INTO bins VALUES(\'A\'),(\'B\'),(\'a\'),(\'b\');\n\nSELECT * FROM bins ORDER BY a;\n+------+\n| a    |\n+------+\n| A    |\n| B    |\n| a    |\n| b    |\n+------+\n\nUsing CAST to sort as a CHAR instead:\n\nSELECT * FROM bins ORDER BY CAST(a AS CHAR);\n+------+\n| a    |\n+------+\n| a    |\n| A    |\n| b    |\n| B    |\n+------+\n\nThe field is a BINARY(10), so padding of two \'\\0\'s are inserted, causing\ncomparisons that don\'t take this into account to fail:\n\nTRUNCATE bins;\n\nINSERT INTO bins VALUES(\'12345678\');\n\nSELECT a = \'12345678\', a = \'12345678\\0\\0\' from bins;\n+----------------+--------------------+\n| a = \'12345678\' | a = \'12345678\\0\\0\' |\n+----------------+--------------------+\n|              0 |                  1 |\n+----------------+--------------------+\n\nURL: https://mariadb.com/kb/en/binary/','','https://mariadb.com/kb/en/binary/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (266,23,'BLOB','Syntax\n------\n\nBLOB[(M)]\n\nDescription\n-----------\n\nA BLOB column with a maximum length of 65,535 (216 - 1) bytes. Each BLOB value\nis stored using a two-byte length prefix that indicates the number of bytes in\nthe value.\n\nAn optional length M can be given for this type. If this is done, MariaDB\ncreates the column as the smallest BLOB type large enough to hold values M\nbytes long.\n\nBLOBS can also be used to store dynamic columns.\n\nBefore MariaDB 10.2.1, BLOB and TEXT columns could not be assigned a DEFAULT\nvalue. This restriction was lifted in MariaDB 10.2.1.\n\nIndexing\n--------\n\nMariaDB starting with 10.4\n--------------------------\nFrom MariaDB 10.4, it is possible to set a unique index on a column that uses\nthe BLOB data type. In previous releases this was not possible, as the index\nwould only guarantee the uniqueness of a fixed number of characters.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, BLOB is a synonym for LONGBLOB.\n\nURL: https://mariadb.com/kb/en/blob/','','https://mariadb.com/kb/en/blob/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (267,23,'BLOB and TEXT Data Types','Description\n-----------\n\nA BLOB is a binary large object that can hold a variable amount of data. The\nfour BLOB types are\n\n* TINYBLOB,\n* BLOB, \n* MEDIUMBLOB, and\n* LONGBLOB.\n\nThese differ only in the maximum length of the values they can hold.\n\nThe TEXT types are\n\n* TINYTEXT,\n* TEXT,\n* MEDIUMTEXT, and\n* LONGTEXT.\n* JSON (alias for LONGTEXT)\n\nThese correspond to the four BLOB types and have the same maximum lengths and\nstorage requirements.\n\nMariaDB starting with 10.2.1\n----------------------------\nStarting from MariaDB 10.2.1, BLOB and TEXT columns can have a DEFAULT value.\n\nMariaDB starting with 10.4.3\n----------------------------\nFrom MariaDB 10.4, it is possible to set a unique index on columns that use\nthe BLOB or TEXT data types.\n\nURL: https://mariadb.com/kb/en/blob-and-text-data-types/','','https://mariadb.com/kb/en/blob-and-text-data-types/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (268,23,'CHAR','This article covers the CHAR data type. See CHAR Function for the function.\n\nSyntax\n------\n\n[NATIONAL] CHAR[(M)] [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA fixed-length string that is always right-padded with spaces to the specified\nlength when stored. M represents the column length in characters. The range of\nM is 0 to 255. If M is omitted, the length is 1.\n\nCHAR(0) columns can contain 2 values: an empty string or NULL. Such columns\ncannot be part of an index. The CONNECT storage engine does not support\nCHAR(0).\n\nNote: Trailing spaces are removed when CHAR values are retrieved unless the\nPAD_CHAR_TO_FULL_LENGTH SQL mode is enabled.\n\nBefore MariaDB 10.2, all collations were of type PADSPACE, meaning that CHAR\n(as well as VARCHAR and TEXT) values are compared without regard for trailing\nspaces. This does not apply to the LIKE pattern-matching operator, which takes\ninto account trailing spaces.\n\nIf a unique index consists of a column where trailing pad characters are\nstripped or ignored, inserts into that column where values differ only by the\nnumber of trailing pad characters will result in a duplicate-key error.\n\nExamples\n--------\n\nTrailing spaces:\n\nCREATE TABLE strtest (c CHAR(10));\nINSERT INTO strtest VALUES(\'Maria   \');\n\nSELECT c=\'Maria\',c=\'Maria   \' FROM strtest;\n+-----------+--------------+\n| c=\'Maria\' | c=\'Maria   \' |\n+-----------+--------------+\n|         1 |            1 |\n+-----------+--------------+\n\nSELECT c LIKE \'Maria\',c LIKE \'Maria   \' FROM strtest;\n+----------------+-------------------+\n| c LIKE \'Maria\' | c LIKE \'Maria   \' |\n+----------------+-------------------+\n|              1 |                 0 |\n+----------------+-------------------+\n\nNO PAD Collations\n-----------------\n\nNO PAD collations regard trailing spaces as normal characters. You can get a\nlist of all NO PAD collations by querying the Information Schema Collations\ntable, for example:\n\nSELECT collation_name FROM information_schema.collations \n WHERE collation_name LIKE \"%nopad%\";\n+------------------------------+\n| collation_name               |\n+------------------------------+\n| big5_chinese_nopad_ci        |\n| big5_nopad_bin               |\n...\n\nURL: https://mariadb.com/kb/en/char/','','https://mariadb.com/kb/en/char/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (269,23,'CHAR BYTE','Description\n-----------\n\nThe CHAR BYTE data type is an alias for the BINARY data type. This is a\ncompatibility feature.\n\nURL: https://mariadb.com/kb/en/char-byte/','','https://mariadb.com/kb/en/char-byte/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (270,23,'ENUM','Syntax\n------\n\nENUM(\'value1\',\'value2\',...) [CHARACTER SET charset_name] [COLLATE\ncollation_name]\n\nDescription\n-----------\n\nAn enumeration. A string object that can have only one value, chosen from the\nlist of values \'value1\', \'value2\', ..., NULL or the special \'\' error value. In\ntheory, an ENUM column can have a maximum of 65,535 distinct values; in\npractice, the real maximum depends on many factors. ENUM values are\nrepresented internally as integers.\n\nTrailing spaces are automatically stripped from ENUM values on table creation.\n\nENUMs require relatively little storage space compared to strings, either one\nor two bytes depending on the number of enumeration values.\n\nNULL and empty values\n---------------------\n\nAn ENUM can also contain NULL and empty values. If the ENUM column is declared\nto permit NULL values, NULL becomes a valid value, as well as the default\nvalue (see below). If strict SQL Mode is not enabled, and an invalid value is\ninserted into an ENUM, a special empty string, with an index value of zero\n(see Numeric index, below), is inserted, with a warning. This may be\nconfusing, because the empty string is also a possible value, and the only\ndifference if that is this case its index is not 0. Inserting will fail with\nan error if strict mode is active.\n\nIf a DEFAULT clause is missing, the default value will be:\n\n* NULL if the column is nullable;\n* otherwise, the first value in the enumeration.\n\nNumeric index\n-------------\n\nENUM values are indexed numerically in the order they are defined, and sorting\nwill be performed in this numeric order. We suggest not using ENUM to store\nnumerals, as there is little to no storage space benefit, and it is easy to\nconfuse the enum integer with the enum numeral value by leaving out the quotes.\n\nAn ENUM defined as ENUM(\'apple\',\'orange\',\'pear\') would have the following\nindex values:\n\n+--------------------------------------+--------------------------------------+\n| Index                                | Value                                |\n+--------------------------------------+--------------------------------------+\n| NULL                                 | NULL                                 |\n+--------------------------------------+--------------------------------------+\n| 0                                    | \'\'                                   |\n+--------------------------------------+--------------------------------------+\n| 1                                    | \'apple\'                              |\n+--------------------------------------+--------------------------------------+\n| 2                                    | \'orange\'                             |\n+--------------------------------------+--------------------------------------+\n| 3                                    | \'pear\'                               |\n+--------------------------------------+--------------------------------------+\n\nExamples\n--------\n\nCREATE TABLE fruits (\n id INT NOT NULL auto_increment PRIMARY KEY,\n fruit ENUM(\'apple\',\'orange\',\'pear\'),\n bushels INT);\n\nDESCRIBE fruits;\n+---------+-------------------------------+------+-----+---------+-------------\n--+\n| Field   | Type                          | Null | Key | Default | Extra      \n |\n+---------+-------------------------------+------+-----+---------+-------------\n--+\n| id      | int(11)                       | NO   | PRI | NULL    |\nauto_increment |\n| fruit   | enum(\'apple\',\'orange\',\'pear\') | YES  |     | NULL    |            \n |\n| bushels | int(11)                       | YES  |     | NULL    |            \n |\n+---------+-------------------------------+------+-----+---------+-------------\n--+\n\nINSERT INTO fruits\n  (fruit,bushels) VALUES\n  (\'pear\',20),\n  (\'apple\',100),\n  (\'orange\',25);\n\nINSERT INTO fruits\n  (fruit,bushels) VALUES\n  (\'avocado\',10);\nERROR 1265 (01000): Data truncated for column \'fruit\' at row 1\n\nSELECT * FROM fruits;\n+----+--------+---------+\n| id | fruit  | bushels |\n+----+--------+---------+\n|  1 | pear   |      20 |\n|  2 | apple  |     100 |\n|  3 | orange |      25 |\n+----+--------+---------+\n\nSelecting by numeric index:\n\nSELECT * FROM fruits WHERE fruit=2;\n+----+--------+---------+\n| id | fruit  | bushels |\n+----+--------+---------+\n|  3 | orange |      25 |\n+----+--------+---------+\n\nSorting is according to the index value:\n\nCREATE TABLE enums (a ENUM(\'2\',\'1\'));\n\nINSERT INTO enums VALUES (\'1\'),(\'2\');\n\nSELECT * FROM enums ORDER BY a ASC;\n+------+\n| a    |\n+------+\n| 2    |\n| 1    |\n+------+\n\nIt\'s easy to get confused between returning the enum integer with the stored\nvalue, so we don\'t suggest using ENUM to store numerals. The first example\nreturns the 1st indexed field (\'2\' has an index value of 1, as it\'s defined\nfirst), while the second example returns the string value \'1\'.\n\nSELECT * FROM enums WHERE a=1;\n+------+\n| a    |\n+------+\n| 2    |\n+------+\n\nSELECT * FROM enums WHERE a=\'1\';\n+------+\n| a    |\n+------+\n| 1    |\n+------+\n\nURL: https://mariadb.com/kb/en/enum/','','https://mariadb.com/kb/en/enum/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (271,23,'JSON Data Type','MariaDB starting with 10.2.7\n----------------------------\nThe JSON alias was added in MariaDB 10.2.7. This was done to make it possible\nto use JSON columns in statement based replication from MySQL to MariaDB and\nto make it possible for MariaDB to read mysqldumps from MySQL.\n\nJSON is an alias for LONGTEXT introduced for compatibility reasons with\nMySQL\'s JSON data type. MariaDB implements this as a LONGTEXT rather, as the\nJSON data type contradicts the SQL standard, and MariaDB\'s benchmarks indicate\nthat performance is at least equivalent.\n\nIn order to ensure that a a valid json document is inserted, the JSON_VALID\nfunction can be used as a CHECK constraint. This constraint is automatically\nincluded for types using the JSON alias from MariaDB 10.4.3.\n\nExamples\n--------\n\nCREATE TABLE t (j JSON);\n\nDESC t;\n+-------+----------+------+-----+---------+-------+\n| Field | Type     | Null | Key | Default | Extra |\n+-------+----------+------+-----+---------+-------+\n| j     | longtext | YES  |     | NULL    |       |\n+-------+----------+------+-----+---------+-------+\n\nWith validation:\n\nCREATE TABLE t2 (\n j JSON\n CHECK (JSON_VALID(j))\n);\n\nINSERT INTO t2 VALUES (\'invalid\');\nERROR 4025 (23000): CONSTRAINT `j` failed for `test`.`t2`\n\nINSERT INTO t2 VALUES (\'{\"id\": 1, \"name\": \"Monty\"}\');\nQuery OK, 1 row affected (0.13 sec)\n\nReplicating JSON Data Between MySQL and MariaDB\n-----------------------------------------------\n\nThe JSON type in MySQL stores the JSON object in a compact form, not as\nLONGTEXT as in MariaDB. This means that row based replication will not work\nfor JSON types from MySQL to MariaDB.\n\nThere are a a few different ways to solve this:\n\n* Use statement based replication.\n* Change the JSON column to type TEXT in MySQL\n* If you must use row-based replication and cannot change the MySQL master\nfrom JSON to TEXT, you can try to introduce an intermediate MySQL slave and\nchange the column type from JSON to TEXT on it. Then you replicate from this\nintermediate slave to MariaDB.\n\nConverting a MySQL TABLE with JSON Fields to MariaDB\n----------------------------------------------------\n\nMariaDB can\'t directly access MySQL\'s JSON format.\n\nThere are a a few different ways to move the table to MariaDB:\n\n* From MariaDB 10.5.7, see the you can use the mysql_json plugin. See Making\nMariaDB understand MySQL JSON.\n* Change the JSON column to type TEXT in MySQL.  After this, MariaDB can\ndirectly use the table without any need for a dump and restore.\n* Use mariadb-dump/mysqldump to copy the table.\n\nDifferences Between MySQL JSON Strings and MariaDB JSON Strings\n---------------------------------------------------------------\n\n* In MySQL, JSON is an object and is compared according to json values. In\nMariaDB JSON strings are normal strings and compared as strings. One exception\nis when using JSON_EXTRACT() in which case strings are unescaped before\ncomparison.\n\nURL: https://mariadb.com/kb/en/json-data-type/','','https://mariadb.com/kb/en/json-data-type/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (272,23,'MEDIUMBLOB','Syntax\n------\n\nMEDIUMBLOB\n\nDescription\n-----------\n\nA BLOB column with a maximum length of 16,777,215 (224 - 1) bytes. Each\nMEDIUMBLOB value is stored using a three-byte length prefix that indicates the\nnumber of bytes in the value.\n\nURL: https://mariadb.com/kb/en/mediumblob/','','https://mariadb.com/kb/en/mediumblob/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (273,23,'MEDIUMTEXT','Syntax\n------\n\nMEDIUMTEXT [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA TEXT column with a maximum length of 16,777,215 (224 - 1) characters. The\neffective maximum length is less if the value contains multi-byte characters.\nEach MEDIUMTEXT value is stored using a three-byte length prefix that\nindicates the number of bytes in the value.\n\nURL: https://mariadb.com/kb/en/mediumtext/','','https://mariadb.com/kb/en/mediumtext/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (274,23,'LONGBLOB','Syntax\n------\n\nLONGBLOB\n\nDescription\n-----------\n\nA BLOB column with a maximum length of 4,294,967,295 bytes or 4GB (232 - 1).\nThe effective maximum length of LONGBLOB columns depends on the configured\nmaximum packet size in the client/server protocol and available memory. Each\nLONGBLOB value is stored using a four-byte length prefix that indicates the\nnumber of bytes in the value.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, BLOB is a synonym for LONGBLOB.\n\nURL: https://mariadb.com/kb/en/longblob/','','https://mariadb.com/kb/en/longblob/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (275,23,'LONGTEXT','Syntax\n------\n\nLONGTEXT [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA TEXT column with a maximum length of 4,294,967,295 or 4GB (232 - 1)\ncharacters. The effective maximum length is less if the value contains\nmulti-byte characters. The effective maximum length of LONGTEXT columns also\ndepends on the configured maximum packet size in the client/server protocol\nand available memory. Each LONGTEXT value is stored using a four-byte length\nprefix that indicates the number of bytes in the value.\n\nFrom MariaDB 10.2.7, JSON is an alias for LONGTEXT. See JSON Data Type for\ndetails.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, CLOB is a synonym for LONGTEXT.\n\nURL: https://mariadb.com/kb/en/longtext/','','https://mariadb.com/kb/en/longtext/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (276,23,'ROW','MariaDB starting with 10.3.0\n----------------------------\nThe ROW data type was introduced in MariaDB 10.3.0.\n\nSyntax\n------\n\nROW (<field name> <data type> [{, <field name> <data type>}... ])\n\nDescription\n-----------\n\nROW is a data type for stored procedure variables.\n\nFeatures\n--------\n\nROW fields as normal variables\n------------------------------\n\nROW fields (members) act as normal variables, and are able to appear in all\nquery parts where a stored procedure variable is allowed:\n\n* Assignment is using the := operator and the SET command:\n\na.x:= 10;\na.x:= b.x;\nSET a.x= 10, a.y=20, a.z= b.z;\n\n* Passing to functions and operators:\n\nSELECT f1(rec.a), rec.a<10;\n\n* Clauses (select list, WHERE, HAVING, LIMIT, etc...,):\n\nSELECT var.a, t1.b FROM t1 WHERE t1.b=var.b LIMIT var.c;\n\n* INSERT values:\n\nINSERT INTO t1 VALUES (rec.a, rec.b, rec.c);\n\n* SELECT .. INTO targets\n\nSELECT a,b INTO rec.a, rec.b FROM t1 WHERE t1.id=10;\n\n* Dynamic SQL out parameters (EXECUTE and EXECUTE IMMEDIATE)\n\nEXECUTE IMMEDIATE \'CALL proc_with_out_param(?)\' USING rec.a;\n\nROW type variables as FETCH targets\n-----------------------------------\n\nROW type variables are allowed as FETCH targets:\n\nFETCH cur INTO rec;\n\nwhere cur is a CURSOR and rec is a ROW type stored procedure variable.\n\nNote, currently an attempt to use FETCH for a ROW type variable returns this\nerror:\n\nERROR 1328 (HY000): Incorrect number of FETCH variables\n\nFETCH from a cursor cur into a ROW variable rec works as follows:\n\n* The number of fields in cur must match the number of fields in rec.\n Otherwise, an error is reported.\n\n* Assignment is done from left to right. The first cursor field is assigned to\n the first variable field, the second cursor field is assigned to the second\n variable field, etc.\n\n* Field names in rec are not important and can differ from field names\n in cur.\n\nSee FETCH Examples (below) for examples of using this with sql_mode=ORACLE and\nsql_mode=DEFAULT.\n\nROW type variables as SELECT...INTO targets\n-------------------------------------------\n\nROW type variables are allowed as SELECT..INTO targets with some differences\ndepending on which sql_mode is in use.\n\n* When using sql_mode=ORACLE, table%ROWTYPE and cursor%ROWTYPE\n variables can be used as SELECT...INTO targets.\n\n* Using multiple ROW variables in the SELECT..INTO list will report an\n error.\n\n* Using ROW variables with a different column count than in\n the SELECT..INTO list will report an error.\n\nSee SELECT...INTO Examples (below) for examples of using this with\nsql_mode=ORACLE and sql_mode=DEFAULT.\n\nFeatures not implemented\n------------------------\n\nThe following features are planned, but not implemented yet:\n\n* Returning a ROW type expression from a stored function (see MDEV-12252).\nThis will need some grammar change to support field names after parentheses:\n\nSELECT f1().x FROM DUAL;\n\n* Returning a ROW type expression from a built-in hybrid type function, such\nas CASE, IF, etc. \n* ROW of ROWs\n\nExamples\n--------\n\nDeclaring a ROW in a stored procedure\n-------------------------------------\n\nDELIMITER $$\nCREATE PROCEDURE p1()\nBEGIN\n DECLARE r ROW (c1 INT, c2 VARCHAR(10));\n SET r.c1= 10;\n SET r.c2= \'test\';\n INSERT INTO t1 VALUES (r.c1, r.c2);\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nFETCH Examples\n--------------\n\nA complete FETCH example for sql_mode=ORACLE:\n\nDROP TABLE IF EXISTS t1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nINSERT INTO t1 VALUES (20,\'b20\');\nINSERT INTO t1 VALUES (30,\'b30\');\n\nSET sql_mode=oracle;\nDROP PROCEDURE IF EXISTS p1;\nDELIMITER $$\nCREATE PROCEDURE p1 AS\n rec ROW(a INT, b VARCHAR(32));\n CURSOR c IS SELECT a,b FROM t1;\nBEGIN\n OPEN c;\n LOOP\n  FETCH c INTO rec;\n  EXIT WHEN c%NOTFOUND;\n  SELECT (\'rec=(\' || rec.a ||\',\'|| rec.b||\')\');\n END LOOP;\n CLOSE c;\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nA complete FETCH example for sql_mode=DEFAULT:\n\nDROP TABLE IF EXISTS t1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nINSERT INTO t1 VALUES (20,\'b20\');\nINSERT INTO t1 VALUES (30,\'b30\');\n\nSET sql_mode=DEFAULT;\nDROP PROCEDURE IF EXISTS p1;\nDELIMITER $$\nCREATE PROCEDURE p1()\nBEGIN\n DECLARE done INT DEFAULT FALSE;\n DECLARE rec ROW(a INT, b VARCHAR(32));\n DECLARE c CURSOR FOR SELECT a,b FROM t1;\n DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n OPEN c;\nread_loop:\n LOOP\n  FETCH c INTO rec;\n  IF done THEN\n   LEAVE read_loop;\n  END IF;\n  SELECT CONCAT(\'rec=(\',rec.a,\',\',rec.b,\')\');\n END LOOP;\n CLOSE c;\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nSELECT...INTO Examples\n----------------------\n\nA SELECT...INTO example for sql_mode=DEFAULT:\n\nSET sql_mode=DEFAULT;\nDROP TABLE IF EXISTS t1;\nDROP PROCEDURE IF EXISTS p1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nDELIMITER $$\nCREATE PROCEDURE p1()\nBEGIN\n DECLARE rec1 ROW(a INT, b VARCHAR(32));\n SELECT * FROM t1 INTO rec1;\n SELECT rec1.a, rec1.b;\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nThe above example returns:\n\n+--------+--------+\n| rec1.a | rec1.b |\n+--------+--------+\n|     10 | b10    |\n+--------+--------+\n\nA SELECT...INTO example for sql_mode=ORACLE:\n\nSET sql_mode=ORACLE;\nDROP TABLE IF EXISTS t1;\nDROP PROCEDURE IF EXISTS p1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nDELIMITER $$\nCREATE PROCEDURE p1 AS\n rec1 ROW(a INT, b VARCHAR(32));\nBEGIN\n SELECT * FROM t1 INTO rec1;\n SELECT rec1.a, rec1.b;\nEND;','','https://mariadb.com/kb/en/row/');
update help_topic set description = CONCAT(description, '\n$$\nDELIMITER ;\nCALL p1();\n\nThe above example returns:\n\n+--------+--------+\n| rec1.a | rec1.b |\n+--------+--------+\n|     10 | b10    |\n+--------+--------+\n\nAn example for sql_mode=ORACLE using table%ROWTYPE variables as SELECT..INTO\ntargets:\n\nSET sql_mode=ORACLE;\nDROP TABLE IF EXISTS t1;\nDROP PROCEDURE IF EXISTS p1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nDELIMITER $$\nCREATE PROCEDURE p1 AS\n rec1 t1%ROWTYPE;\nBEGIN\n SELECT * FROM t1 INTO rec1;\n SELECT rec1.a, rec1.b;\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nThe above example returns:\n\n+--------+--------+\n| rec1.a | rec1.b |\n+--------+--------+\n|     10 | b10    |\n+--------+--------+\n\nAn example for sql_mode=ORACLE using cursor%ROWTYPE variables as SELECT..INTO\ntargets:\n\nSET sql_mode=ORACLE;\nDROP TABLE IF EXISTS t1;\nDROP PROCEDURE IF EXISTS p1;\nCREATE TABLE t1 (a INT, b VARCHAR(32));\nINSERT INTO t1 VALUES (10,\'b10\');\nDELIMITER $$\nCREATE PROCEDURE p1 AS\n CURSOR cur1 IS SELECT * FROM t1;\n rec1 cur1%ROWTYPE;\nBEGIN\n SELECT * FROM t1 INTO rec1;\n SELECT rec1.a, rec1.b;\nEND;\n$$\nDELIMITER ;\nCALL p1();\n\nThe above example returns:\n\n+--------+--------+\n| rec1.a | rec1.b |\n+--------+--------+\n|     10 | b10    |\n+--------+--------+\n\nURL: https://mariadb.com/kb/en/row/') WHERE help_topic_id = 276;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (277,23,'TEXT','Syntax\n------\n\nTEXT[(M)] [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA TEXT column with a maximum length of 65,535 (216 - 1) characters. The\neffective maximum length is less if the value contains multi-byte characters.\nEach TEXT value is stored using a two-byte length prefix that indicates the\nnumber of bytes in the value. If you need a bigger storage, consider using\nMEDIUMTEXT instead.\n\nAn optional length M can be given for this type. If this is done, MariaDB\ncreates the column as the smallest TEXT type large enough to hold values M\ncharacters long.\n\nBefore MariaDB 10.2, all MariaDB collations were of type PADSPACE, meaning\nthat TEXT (as well as VARCHAR and CHAR values) are compared without regard for\ntrailing spaces. This does not apply to the LIKE pattern-matching operator,\nwhich takes into account trailing spaces.\n\nBefore MariaDB 10.2.1, BLOB and TEXT columns could not be assigned a DEFAULT\nvalue. This restriction was lifted in MariaDB 10.2.1.\n\nExamples\n--------\n\nTrailing spaces:\n\nCREATE TABLE strtest (d TEXT(10));\nINSERT INTO strtest VALUES(\'Maria   \');\n\nSELECT d=\'Maria\',d=\'Maria   \' FROM strtest;\n+-----------+--------------+\n| d=\'Maria\' | d=\'Maria   \' |\n+-----------+--------------+\n|         1 |            1 |\n+-----------+--------------+\n\nSELECT d LIKE \'Maria\',d LIKE \'Maria   \' FROM strtest;\n+----------------+-------------------+\n| d LIKE \'Maria\' | d LIKE \'Maria   \' |\n+----------------+-------------------+\n|              0 |                 1 |\n+----------------+-------------------+\n\nIndexing\n--------\n\nTEXT columns can only be indexed over a specified length. This means that they\ncannot be used as the primary key of a table norm until MariaDB 10.4, can a\nunique index be created on them.\n\nMariaDB starting with 10.4\n--------------------------\nStarting with MariaDB 10.4, a unique index can be created on a TEXT column.\n\nInternally, this uses hash indexing to quickly check the values and if a hash\ncollision is found, the actual stored values are compared in order to retain\nthe uniqueness.\n\nDifference between VARCHAR and TEXT\n-----------------------------------\n\n* VARCHAR columns can be fully indexed. TEXT columns can only be indexed over\na specified length.\n* Using TEXT or BLOB in a SELECT query that uses temporary tables for storing\nintermediate results will force the temporary table to be disk based (using\nthe Aria storage engine instead of the memory storage engine, which is a bit\nslower. This is not that bad as the Aria storage engine caches the rows in\nmemory. To get the benefit of this, one should ensure that the\naria_pagecache_buffer_size variable is big enough to hold most of the row and\nindex data for temporary tables.\n\nFor Storage Engine Developers\n-----------------------------\n\n* Internally the full length of the VARCHAR column is allocated inside each\nTABLE objects record[] structure. As there are three such buffers, each open\ntable will allocate 3 times max-length-to-store-varchar bytes of memory.\n* TEXT and BLOB columns are stored with a pointer (4 or 8 bytes) + a 1-4 bytes\nlength.  The TEXT data is only stored once. This means that internally TEXT\nuses less memory for each open table but instead has the additional overhead\nthat each TEXT object needs to be allocated and freed for each row access\n(with some caching in between).\n\nURL: https://mariadb.com/kb/en/text/','','https://mariadb.com/kb/en/text/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (278,23,'TINYBLOB','Syntax\n------\n\nTINYBLOB\n\nDescription\n-----------\n\nA BLOB column with a maximum length of 255 (28 - 1) bytes. Each TINYBLOB value\nis stored using a one-byte length prefix that indicates the number of bytes in\nthe value.\n\nURL: https://mariadb.com/kb/en/tinyblob/','','https://mariadb.com/kb/en/tinyblob/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (279,23,'TINYTEXT','Syntax\n------\n\nTINYTEXT [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA TEXT column with a maximum length of 255 (28 - 1) characters. The effective\nmaximum length is less if the value contains multi-byte characters. Each\nTINYTEXT value is stored using a one-byte length prefix that indicates the\nnumber of bytes in the value.\n\nURL: https://mariadb.com/kb/en/tinytext/','','https://mariadb.com/kb/en/tinytext/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (280,23,'VARBINARY','Syntax\n------\n\nVARBINARY(M)\n\nDescription\n-----------\n\nThe VARBINARY type is similar to the VARCHAR type, but stores binary byte\nstrings rather than non-binary character strings. M represents the maximum\ncolumn length in bytes.\n\nIt contains no character set, and comparison and sorting are based on the\nnumeric value of the bytes.\n\nIf the maximum length is exceeded, and SQL strict mode is not enabled , the\nextra characters will be dropped with a warning. If strict mode is enabled, an\nerror will occur.\n\nUnlike BINARY values, VARBINARYs are not right-padded when inserting.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, RAW is a synonym for VARBINARY.\n\nExamples\n--------\n\nInserting too many characters, first with strict mode off, then with it on:\n\nCREATE TABLE varbins (a VARBINARY(10));\n\nINSERT INTO varbins VALUES(\'12345678901\');\nQuery OK, 1 row affected, 1 warning (0.04 sec)\n\nSELECT * FROM varbins;\n+------------+\n| a          |\n+------------+\n| 1234567890 |\n+------------+\n\nSET sql_mode=\'STRICT_ALL_TABLES\';\n\nINSERT INTO varbins VALUES(\'12345678901\');\nERROR 1406 (22001): Data too long for column \'a\' at row 1\n\nSorting is performed with the byte value:\n\nTRUNCATE varbins;\n\nINSERT INTO varbins VALUES(\'A\'),(\'B\'),(\'a\'),(\'b\');\n\nSELECT * FROM varbins ORDER BY a;\n+------+\n| a    |\n+------+\n| A    |\n| B    |\n| a    |\n| b    |\n+------+\n\nUsing CAST to sort as a CHAR instead:\n\nSELECT * FROM varbins ORDER BY CAST(a AS CHAR);\n+------+\n| a    |\n+------+\n| a    |\n| A    |\n| b    |\n| B    |\n+------+\n\nURL: https://mariadb.com/kb/en/varbinary/','','https://mariadb.com/kb/en/varbinary/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (281,23,'VARCHAR','Syntax\n------\n\n[NATIONAL] VARCHAR(M) [CHARACTER SET charset_name] [COLLATE collation_name]\n\nDescription\n-----------\n\nA variable-length string. M represents the maximum column length in\ncharacters. The range of M is 0 to 65,532. The effective maximum length of a\nVARCHAR is subject to the maximum row size and the character set used. For\nexample, utf8 characters can require up to three bytes per character, so a\nVARCHAR column that uses the utf8 character set can be declared to be a\nmaximum of 21,844 characters.\n\nNote: For the ColumnStore engine, M represents the maximum column length in\nbytes.\n\nMariaDB stores VARCHAR values as a one-byte or two-byte length prefix plus\ndata. The length prefix indicates the number of bytes in the value. A VARCHAR\ncolumn uses one length byte if values require no more than 255 bytes, two\nlength bytes if values may require more than 255 bytes.\n\nMariaDB follows the standard SQL specification, and does not remove trailing\nspaces from VARCHAR values.\n\nVARCHAR(0) columns can contain 2 values: an empty string or NULL. Such columns\ncannot be part of an index. The CONNECT storage engine does not support\nVARCHAR(0).\n\nVARCHAR is shorthand for CHARACTER VARYING. NATIONAL VARCHAR is the standard\nSQL way to define that a VARCHAR column should use some predefined character\nset. MariaDB uses utf8 as this predefined character set, as does MySQL 4.1 and\nup. NVARCHAR is shorthand for NATIONAL VARCHAR.\n\nBefore MariaDB 10.2, all MariaDB collations were of type PADSPACE, meaning\nthat VARCHAR (as well as CHAR and TEXT values) are compared without regard for\ntrailing spaces. This does not apply to the LIKE pattern-matching operator,\nwhich takes into account trailing spaces. From MariaDB 10.2, a number of NO\nPAD collations are available.\n\nIf a unique index consists of a column where trailing pad characters are\nstripped or ignored, inserts into that column where values differ only by the\nnumber of trailing pad characters will result in a duplicate-key error.\n\nExamples\n--------\n\nThe following are equivalent:\n\nVARCHAR(30) CHARACTER SET utf8\nNATIONAL VARCHAR(30)\nNVARCHAR(30)\nNCHAR VARCHAR(30)\nNATIONAL CHARACTER VARYING(30)\nNATIONAL CHAR VARYING(30)\n\nTrailing spaces:\n\nCREATE TABLE strtest (v VARCHAR(10));\nINSERT INTO strtest VALUES(\'Maria   \');\n\nSELECT v=\'Maria\',v=\'Maria   \' FROM strtest;\n+-----------+--------------+\n| v=\'Maria\' | v=\'Maria   \' |\n+-----------+--------------+\n|         1 |            1 |\n+-----------+--------------+\n\nSELECT v LIKE \'Maria\',v LIKE \'Maria   \' FROM strtest;\n+----------------+-------------------+\n| v LIKE \'Maria\' | v LIKE \'Maria   \' |\n+----------------+-------------------+\n|              0 |                 1 |\n+----------------+-------------------+\n\nTruncation\n----------\n\n* Depending on whether or not strict sql mode is set, you will either get a\nwarning or an error if you try to insert a string that is too long into a\nVARCHAR column. If the extra characters are spaces, the spaces that can\'t fit\nwill be removed and you will always get a warning, regardless of the sql mode\nsetting.\n\nDifference Between VARCHAR and TEXT\n-----------------------------------\n\n* VARCHAR columns can be fully indexed. TEXT columns can only be indexed over\na specified length.\n* Using TEXT or BLOB in a SELECT query that uses temporary tables for storing\nintermediate results will force the temporary table to be disk based (using\nthe Aria storage engine instead of the memory storage engine, which is a bit\nslower. This is not that bad as the Aria storage engine caches the rows in\nmemory. To get the benefit of this, one should ensure that the\naria_pagecache_buffer_size variable is big enough to hold most of the row and\nindex data for temporary tables.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, VARCHAR2 is a synonym.\n\nFor Storage Engine Developers\n-----------------------------\n\n* Internally the full length of the VARCHAR column is allocated inside each\nTABLE objects record[] structure. As there are three such buffers, each open\ntable will allocate 3 times max-length-to-store-varchar bytes of memory.\n* TEXT and BLOB columns are stored with a pointer (4 or 8 bytes) + a 1-4 bytes\nlength.  The TEXT data is only stored once. This means that internally TEXT\nuses less memory for each open table but instead has the additional overhead\nthat each TEXT object needs to be allocated and freed for each row access\n(with some caching in between).\n\nURL: https://mariadb.com/kb/en/varchar/','','https://mariadb.com/kb/en/varchar/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (282,23,'SET Data Type','Syntax\n------\n\nSET(\'value1\',\'value2\',...) [CHARACTER SET charset_name] [COLLATE\ncollation_name]\n\nDescription\n-----------\n\nA set. A string object that can have zero or more values, each of which must\nbe chosen from the list of values \'value1\', \'value2\', ... A SET column can\nhave a maximum of 64 members. SET values are represented internally as\nintegers.\n\nSET values cannot contain commas.\n\nIf a SET contains duplicate values, an error will be returned if strict mode\nis enabled, or a warning if strict mode is not enabled.\n\nURL: https://mariadb.com/kb/en/set-data-type/','','https://mariadb.com/kb/en/set-data-type/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (283,23,'DATE','Syntax\n------\n\nDATE\n\nDescription\n-----------\n\nA date. The supported range is \'1000-01-01\' to \'9999-12-31\'. MariaDB displays\nDATE values in \'YYYY-MM-DD\' format, but can be assigned dates in looser\nformats, including strings or numbers, as long as they make sense. These\ninclude a short year, YY-MM-DD, no delimiters, YYMMDD, or any other acceptable\ndelimiter, for example YYYY/MM/DD. For details, see date and time literals.\n\n\'0000-00-00\' is a permitted special value (zero-date), unless the NO_ZERO_DATE\nSQL_MODE is used. Also, individual components of a date can be set to 0 (for\nexample: \'2015-00-12\'), unless the NO_ZERO_IN_DATE SQL_MODE is used. In many\ncases, the result of en expression involving a zero-date, or a date with\nzero-parts, is NULL. If the ALLOW_INVALID_DATES SQL_MODE is enabled, if the\nday part is in the range between 1 and 31, the date does not produce any\nerror, even for months that have less than 31 days.\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, DATE with a time portion is a synonym for\nDATETIME. See also mariadb_schema.\n\nExamples\n--------\n\nCREATE TABLE t1 (d DATE);\n\nINSERT INTO t1 VALUES (\"2010-01-12\"), (\"2011-2-28\"), (\'120314\'),(\'13*04*21\');\n\nSELECT * FROM t1;\n+------------+\n| d          |\n+------------+\n| 2010-01-12 |\n| 2011-02-28 |\n| 2012-03-14 |\n| 2013-04-21 |\n+------------+\n\nURL: https://mariadb.com/kb/en/date/','','https://mariadb.com/kb/en/date/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (284,23,'TIME','Syntax\n------\n\nTIME [(<microsecond precision>)]\n\nDescription\n-----------\n\nA time. The range is \'-838:59:59.999999\' to \'838:59:59.999999\'. Microsecond\nprecision can be from 0-6; if not specified 0 is used. Microseconds have been\navailable since MariaDB 5.3.\n\nMariaDB displays TIME values in \'HH:MM:SS.ssssss\' format, but allows\nassignment of times in looser formats, including \'D HH:MM:SS\', \'HH:MM:SS\',\n\'HH:MM\', \'D HH:MM\', \'D HH\', \'SS\', or \'HHMMSS\', as well as permitting dropping\nof any leading zeros when a delimiter is provided, for example \'3:9:10\'. For\ndetails, see date and time literals.\n\nMariaDB starting with 10.1.2\n----------------------------\nMariaDB 10.1.2 introduced the --mysql56-temporal-format option, on by default,\nwhich allows MariaDB to store TIMEs using the same low-level format MySQL 5.6\nuses.\n\nInternal Format\n---------------\n\nIn MariaDB 10.1.2 a new temporal format was introduced from MySQL 5.6 that\nalters how the TIME, DATETIME and TIMESTAMP columns operate at lower levels.\nThese changes allow these temporal data types to have fractional parts and\nnegative values. You can disable this feature using the\nmysql56_temporal_format system variable.\n\nTables that include TIMESTAMP values that were created on an older version of\nMariaDB or that were created while the mysql56_temporal_format system variable\nwas disabled continue to store data using the older data type format.\n\nIn order to update table columns from the older format to the newer format,\nexecute an ALTER TABLE... MODIFY COLUMN statement that changes the column to\nthe *same* data type. This change may be needed if you want to export the\ntable\'s tablespace and import it onto a server that has\nmysql56_temporal_format=ON set (see MDEV-15225).\n\nFor instance, if you have a TIME column in your table:\n\nSHOW VARIABLES LIKE \'mysql56_temporal_format\';\n\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| mysql56_temporal_format | ON    |\n+-------------------------+-------+\n\nALTER TABLE example_table MODIFY ts_col TIME;\n\nWhen MariaDB executes the ALTER TABLE statement, it converts the data from the\nolder temporal format to the newer one.\n\nIn the event that you have several tables and columns using temporal data\ntypes that you want to switch over to the new format, make sure the system\nvariable is enabled, then perform a dump and restore using mysqldump. The\ncolumns using relevant temporal data types are restored using the new temporal\nformat.\n\nStarting from MariaDB 10.5.1 columns with old temporal formats are marked with\na /* mariadb-5.3 */ comment in the output of SHOW CREATE TABLE, SHOW COLUMNS,\nDESCRIBE statements, as well as in the COLUMN_TYPE column of the\nINFORMATION_SCHEMA.COLUMNS Table.\n\nSHOW CREATE TABLE mariadb5312_time\\G\n*************************** 1. row ***************************\n   Table: mariadb5312_time\nCreate Table: CREATE TABLE `mariadb5312_time` (\n `t0` time /* mariadb-5.3 */ DEFAULT NULL,\n `t6` time(6) /* mariadb-5.3 */ DEFAULT NULL\n) ENGINE=MyISAM DEFAULT CHARSET=latin1\n\nNote, columns with the current format are not marked with a comment.\n\nExamples\n--------\n\nINSERT INTO time VALUES (\'90:00:00\'), (\'800:00:00\'), (800), (22), (151413),\n(\'9:6:3\'), (\'12 09\');\n\nSELECT * FROM time;\n+-----------+\n| t         |\n+-----------+\n| 90:00:00  |\n| 800:00:00 |\n| 00:08:00  |\n| 00:00:22  |\n| 15:14:13  |\n| 09:06:03  |\n| 297:00:00 |\n+-----------+\n\nURL: https://mariadb.com/kb/en/time/','','https://mariadb.com/kb/en/time/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (285,23,'DATETIME','Syntax\n------\n\nDATETIME [(microsecond precision)]\n\nDescription\n-----------\n\nA date and time combination.\n\nMariaDB displays DATETIME values in \'YYYY-MM-DD HH:MM:SS.ffffff\' format, but\nallows assignment of values to DATETIME columns using either strings or\nnumbers. For details, see date and time literals.\n\nDATETIME columns also accept CURRENT_TIMESTAMP as the default value.\n\nMariaDB 10.1.2 introduced the --mysql56-temporal-format option, on by default,\nwhich allows MariaDB to store DATETMEs using the same low-level format MySQL\n5.6 uses. For more information, see Internal Format, below.\n\nFor storage requirements, see Data Type Storage Requirements.\n\nSupported Values\n----------------\n\nMariaDB stores values that use the DATETIME data type in a format that\nsupports values between 1000-01-01 00:00:00.000000 and 9999-12-31\n23:59:59.999999.\n\nMariaDB can also store microseconds with a precision between 0 and 6. If no\nmicrosecond precision is specified, then 0 is used by default.\n\nMariaDB also supports \'0000-00-00\' as a special zero-date value, unless\nNO_ZERO_DATE is specified in the SQL_MODE. Similarly, individual components of\na date can be set to 0 (for example: \'2015-00-12\'), unless NO_ZERO_IN_DATE is\nspecified in the SQL_MODE. In many cases, the result of en expression\ninvolving a zero-date, or a date with zero-parts, is NULL. If the\nALLOW_INVALID_DATES SQL_MODE is enabled, if the day part is in the range\nbetween 1 and 31, the date does not produce any error, even for months that\nhave less than 31 days.\n\nTime Zones\n----------\n\nIf a column uses the DATETIME data type, then any inserted values are stored\nas-is, so no automatic time zone conversions are performed.\n\nMariaDB also does not currently support time zone literals that contain time\nzone identifiers. See MDEV-11829 for more information.\n\nMariaDB validates DATETIME literals against the session\'s time zone. For\nexample, if a specific time range never occurred in a specific time zone due\nto daylight savings time, then DATETIME values within that range would be\ninvalid for that time zone.\n\nFor example, daylight savings time started on March 10, 2019 in the US, so the\ntime range between 02:00:00 and 02:59:59 is invalid for that day in US time\nzones:\n\nSET time_zone = \'America/New_York\';\nQuery OK, 0 rows affected (0.000 sec)\n\nINSERT INTO timestamp_test VALUES (\'2019-03-10 02:55:05\');\nERROR 1292 (22007): Incorrect datetime value: \'2019-03-10 02:55:05\' for column\n`db1`.`timestamp_test`.`timestamp_test` at row 1\n\nBut that same time range is fine in other time zones, such as Coordinated\nUniversal Time (UTC). For example:\n\nSET time_zone = \'UTC\';\nQuery OK, 0 rows affected (0.000 sec)\n\nINSERT INTO timestamp_test VALUES (\'2019-03-10 02:55:05\');\nQuery OK, 1 row affected (0.002 sec)\n\nOracle Mode\n-----------\n\nMariaDB starting with 10.3\n--------------------------\nIn Oracle mode from MariaDB 10.3, DATE with a time portion is a synonym for\nDATETIME. See also mariadb_schema.\n\nInternal Format\n---------------\n\nIn MariaDB 10.1.2 a new temporal format was introduced from MySQL 5.6 that\nalters how the TIME, DATETIME and TIMESTAMP columns operate at lower levels.\nThese changes allow these temporal data types to have fractional parts and\nnegative values. You can disable this feature using the\nmysql56_temporal_format system variable.\n\nTables that include TIMESTAMP values that were created on an older version of\nMariaDB or that were created while the mysql56_temporal_format system variable\nwas disabled continue to store data using the older data type format.\n\nIn order to update table columns from the older format to the newer format,\nexecute an ALTER TABLE... MODIFY COLUMN statement that changes the column to\nthe *same* data type. This change may be needed if you want to export the\ntable\'s tablespace and import it onto a server that has\nmysql56_temporal_format=ON set (see MDEV-15225).\n\nFor instance, if you have a DATETIME column in your table:\n\nSHOW VARIABLES LIKE \'mysql56_temporal_format\';\n\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| mysql56_temporal_format | ON    |\n+-------------------------+-------+\n\nALTER TABLE example_table MODIFY ts_col DATETIME;\n\nWhen MariaDB executes the ALTER TABLE statement, it converts the data from the\nolder temporal format to the newer one.\n\nIn the event that you have several tables and columns using temporal data\ntypes that you want to switch over to the new format, make sure the system\nvariable is enabled, then perform a dump and restore using mysqldump. The\ncolumns using relevant temporal data types are restored using the new temporal\nformat.\n\nStarting from MariaDB 10.5.1 columns with old temporal formats are marked with\na /* mariadb-5.3 */ comment in the output of SHOW CREATE TABLE, SHOW COLUMNS,\nDESCRIBE statements, as well as in the COLUMN_TYPE column of the\nINFORMATION_SCHEMA.COLUMNS Table.\n\nSHOW CREATE TABLE mariadb5312_datetime\\G\n*************************** 1. row ***************************\n   Table: mariadb5312_datetime\nCreate Table: CREATE TABLE `mariadb5312_datetime` (\n `dt0` datetime /* mariadb-5.3 */ DEFAULT NULL,\n `dt6` datetime(6) /* mariadb-5.3 */ DEFAULT NULL\n) ENGINE=MyISAM DEFAULT CHARSET=latin1\n\nExamples\n--------\n\nCREATE TABLE t1 (d DATETIME);\n\nINSERT INTO t1 VALUES (\"2011-03-11\"), (\"2012-04-19 13:08:22\"),\n (\"2013-07-18 13:44:22.123456\");\n\nSELECT * FROM t1;\n+---------------------+','','https://mariadb.com/kb/en/datetime/');
update help_topic set description = CONCAT(description, '\n| d                   |\n+---------------------+\n| 2011-03-11 00:00:00 |\n| 2012-04-19 13:08:22 |\n| 2013-07-18 13:44:22 |\n+---------------------+\n\nCREATE TABLE t2 (d DATETIME(6));\n\nINSERT INTO t2 VALUES (\"2011-03-11\"), (\"2012-04-19 13:08:22\"),\n (\"2013-07-18 13:44:22.123456\");\n\nSELECT * FROM t2;\n+----------------------------+\n| d                          |\n+----------------------------+\n| 2011-03-11 00:00:00.000000 |\n| 2012-04-19 13:08:22.000000 |\n| 2013-07-18 13:44:22.123456 |\n+----------------------------++\n\nStrings used in datetime context are automatically converted to datetime(6).\nIf you want to have a datetime without seconds, you should use\nCONVERT(..,datetime).\n\nSELECT CONVERT(\'2007-11-30 10:30:19\',datetime);\n+-----------------------------------------+\n| CONVERT(\'2007-11-30 10:30:19\',datetime) |\n+-----------------------------------------+\n| 2007-11-30 10:30:19                     |\n+-----------------------------------------+\n\nSELECT CONVERT(\'2007-11-30 10:30:19\',datetime(6));\n+--------------------------------------------+\n| CONVERT(\'2007-11-30 10:30:19\',datetime(6)) |\n+--------------------------------------------+\n| 2007-11-30 10:30:19.000000                 |\n+--------------------------------------------+\n\nURL: https://mariadb.com/kb/en/datetime/') WHERE help_topic_id = 285;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (286,23,'TIMESTAMP','Syntax\n------\n\nTIMESTAMP [(<microsecond precision)]\n\nDescription\n-----------\n\nA timestamp in the format YYYY-MM-DD HH:MM:SS.ffffff.\n\nThe timestamp field is generally used to define at which moment in time a row\nwas added or updated and by default will automatically be assigned the current\ndatetime when a record is inserted or updated. The automatic properties only\napply to the first TIMESTAMP in the record; subsequent TIMESTAMP columns will\nnot be changed.\n\nMariaDB includes the --mysql56-temporal-format option, on by default, which\nallows MariaDB to store TIMESTAMPs using the same low-level format MySQL 5.6\nuses.\n\nFor more information, see Internal Format.\n\nSupported Values\n----------------\n\nMariaDB stores values that use the TIMESTAMP data type as the number of\nseconds since \'1970-01-01 00:00:00\' (UTC). This means that the TIMESTAMP data\ntype can hold values between \'1970-01-01 00:00:01\' (UTC) and \'2038-01-19\n03:14:07\' (UTC).\n\nMariaDB can also store microseconds with a precision between 0 and 6. If no\nmicrosecond precision is specified, then 0 is used by default.\n\nAutomatic Values\n----------------\n\nMariaDB has special behavior for the first column that uses the TIMESTAMP data\ntype in a specific table. For the first column that uses the TIMESTAMP data\ntype in a specific table, MariaDB automatically assigns the following\nproperties to the column:\n\n* DEFAULT CURRENT_TIMESTAMP\n* ON UPDATE CURRENT_TIMESTAMP\n\nThis means that if the column is not explicitly assigned a value in an INSERT\nor UPDATE query, then MariaDB will automatically initialize the column\'s value\nwith the current date and time.\n\nThis automatic initialization for INSERT and UPDATE queries can also be\nexplicitly enabled for a column that uses the TIMESTAMP data type by\nspecifying the DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP\nclauses for the column. In these clauses, any synonym of CURRENT_TIMESTAMP is\naccepted, including CURRENT_TIMESTAMP(), NOW(), LOCALTIME, LOCALTIME(),\nLOCALTIMESTAMP, and LOCALTIMESTAMP().\n\nThis automatic initialization for INSERT queries can also be explicitly\ndisabled for a column that uses the TIMESTAMP data type by specifying a\nconstant DEFAULT value. For example, DEFAULT 0.\n\nThis automatic initialization for UPDATE queries can also be explicitly\ndisabled for a column that uses the TIMESTAMP data type by specifying a\nDEFAULT clause for the column, but no ON UPDATE clause. If a DEFAULT clause is\nexplicitly specified for a column that uses the TIMESTAMP data type, but an ON\nUPDATE clause is not specified for the column, then the timestamp value will\nnot automatically change when an UPDATE statement is executed.\n\nMariaDB also has special behavior if NULL is assigned to column that uses the\nTIMESTAMP data type. If the column is assigned the NULL value in an INSERT or\nUPDATE query, then MariaDB will automatically initialize the column\'s value\nwith the current date and time. For details, see NULL values in MariaDB.\n\nThis automatic initialization for NULL values can also be explicitly disabled\nfor a column that uses the TIMESTAMP data type by specifying the NULL\nattribute for the column. In this case, if the column\'s value is set to NULL,\nthen the column\'s value will actually be set to NULL.\n\nTime Zones\n----------\n\nIf a column uses the TIMESTAMP data type, then any inserted values are\nconverted from the session\'s time zone to Coordinated Universal Time (UTC)\nwhen stored, and converted back to the session\'s time zone when retrieved.\n\nMariaDB does not currently store any time zone identifier with the value of\nthe TIMESTAMP data type. See MDEV-10018 for more information.\n\nMariaDB does not currently support time zone literals that contain time zone\nidentifiers. See MDEV-11829 for more information.\n\nLimitations\n-----------\n\n* Because the TIMESTAMP value is stored as Epoch Seconds, the timestamp value\n\'1970-01-01 00:00:00\' (UTC) is reserved since the second #0 is used to\nrepresent \'0000-00-00 00:00:00\'.\n* In MariaDB 5.5 and before there could only be one TIMESTAMP column per table\nthat had CURRENT_TIMESTAMP defined as its default value. This limit has no\nlonger applied since MariaDB 10.0.\n\nSQL_MODE=MAXDB\n--------------\n\nIf the SQL_MODE is set to MAXDB, TIMESTAMP fields will be silently converted\nto DATETIME.\n\nInternal Format\n---------------\n\nIn MariaDB 10.1.2 a new temporal format was introduced from MySQL 5.6 that\nalters how the TIME, DATETIME and TIMESTAMP columns operate at lower levels.\nThese changes allow these temporal data types to have fractional parts and\nnegative values. You can disable this feature using the\nmysql56_temporal_format system variable.\n\nTables that include TIMESTAMP values that were created on an older version of\nMariaDB or that were created while the mysql56_temporal_format system variable\nwas disabled continue to store data using the older data type format.\n\nIn order to update table columns from the older format to the newer format,\nexecute an ALTER TABLE... MODIFY COLUMN statement that changes the column to\nthe *same* data type. This change may be needed if you want to export the\ntable\'s tablespace and import it onto a server that has\nmysql56_temporal_format=ON set (see MDEV-15225).\n\nFor instance, if you have a TIMESTAMP column in your table:\n\nSHOW VARIABLES LIKE \'mysql56_temporal_format\';\n\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| mysql56_temporal_format | ON    |','','https://mariadb.com/kb/en/timestamp/');
update help_topic set description = CONCAT(description, '\n+-------------------------+-------+\n\nALTER TABLE example_table MODIFY ts_col TIMESTAMP;\n\nWhen MariaDB executes the ALTER TABLE statement, it converts the data from the\nolder temporal format to the newer one.\n\nIn the event that you have several tables and columns using temporal data\ntypes that you want to switch over to the new format, make sure the system\nvariable is enabled, then perform a dump and restore using mysqldump. The\ncolumns using relevant temporal data types are restored using the new temporal\nformat.\n\nStarting from MariaDB 10.5.1 columns with old temporal formats are marked with\na /* mariadb-5.3 */ comment in the output of SHOW CREATE TABLE, SHOW COLUMNS,\nDESCRIBE statements, as well as in the COLUMN_TYPE column of the\nINFORMATION_SCHEMA.COLUMNS Table.\n\nSHOW CREATE TABLE mariadb5312_timestamp\\G\n*************************** 1. row ***************************\n   Table: mariadb5312_timestamp\nCreate Table: CREATE TABLE `mariadb5312_timestamp` (\n `ts0` timestamp /* mariadb-5.3 */ NOT NULL DEFAULT current_timestamp() ON\nUPDATE current_timestamp(),\n `ts6` timestamp(6) /* mariadb-5.3 */ NOT NULL DEFAULT \'0000-00-00\n00:00:00.000000\'\n) ENGINE=MyISAM DEFAULT CHARSET=latin1\n\nNote: Prior to MySQL 4.1 a different format for the TIMESTAMP datatype was\nused. This format is unsupported in MariaDB 5.1 and upwards.\n\nExamples\n--------\n\nCREATE TABLE t (id INT, ts TIMESTAMP);\n\nDESC t;\n+-------+-----------+------+-----+-------------------+-------------------------\n---+\n| Field | Type      | Null | Key | Default           | Extra                  \n  |\n+-------+-----------+------+-----+-------------------+-------------------------\n---+\n| id    | int(11)   | YES  |     | NULL              |                        \n  |\n| ts    | timestamp | NO   |     | CURRENT_TIMESTAMP | on update\nCURRENT_TIMESTAMP |\n+-------+-----------+------+-----+-------------------+-------------------------\n---+\n\nINSERT INTO t(id)  VALUES (1),(2);\n\nSELECT * FROM t;\n+------+---------------------+\n| id   | ts                  |\n+------+---------------------+\n|    1 | 2013-07-22 12:50:05 |\n|    2 | 2013-07-22 12:50:05 |\n+------+---------------------+\n\nINSERT INTO t  VALUES (3,NULL),(4,\'2001-07-22 12:12:12\');\n\nSELECT * FROM t;\n+------+---------------------+\n| id   | ts                  |\n+------+---------------------+\n|    1 | 2013-07-22 12:50:05 |\n|    2 | 2013-07-22 12:50:05 |\n|    3 | 2013-07-22 12:51:56 |\n|    4 | 2001-07-22 12:12:12 |\n+------+---------------------+\n\nConverting to Unix epoch:\n\nSELECT ts, UNIX_TIMESTAMP(ts) FROM t;\n+---------------------+--------------------+\n| ts                  | UNIX_TIMESTAMP(ts) |\n+---------------------+--------------------+\n| 2013-07-22 12:50:05 |         1374490205 |\n| 2013-07-22 12:50:05 |         1374490205 |\n| 2013-07-22 12:51:56 |         1374490316 |\n| 2001-07-22 12:12:12 |          995796732 |\n+---------------------+--------------------+\n\nUpdate also changes the timestamp:\n\nUPDATE t set id=5 WHERE id=1;\n\nSELECT * FROM t;\n+------+---------------------+\n| id   | ts                  |\n+------+---------------------+\n|    5 | 2013-07-22 14:52:33 |\n|    2 | 2013-07-22 12:50:05 |\n|    3 | 2013-07-22 12:51:56 |\n|    4 | 2001-07-22 12:12:12 |\n+------+---------------------+\n\nDefault NULL:\n\nCREATE TABLE t2 (id INT, ts TIMESTAMP NULL ON UPDATE CURRENT_TIMESTAMP);\n\nINSERT INTO t(id)  VALUES (1),(2);\n\nSELECT * FROM t2;\n\nINSERT INTO t2(id)  VALUES (1),(2);\n\nSELECT * FROM t2;\n+------+------+\n| id   | ts   |\n+------+------+\n|    1 | NULL |\n|    2 | NULL |\n+------+------+\n\nUPDATE t2 SET id=3 WHERE id=1;\n\nSELECT * FROM t2;\n+------+---------------------+\n| id   | ts                  |\n+------+---------------------+\n|    3 | 2013-07-22 15:32:22 |\n|    2 | NULL                |\n+------+---------------------+\n\nOnly the first timestamp is automatically inserted and updated:\n\nCREATE TABLE t3 (id INT, ts1 TIMESTAMP, ts2 TIMESTAMP);\n\nINSERT INTO t3(id)  VALUES (1),(2);\n\nSELECT * FROM t3;\n+------+---------------------+---------------------+\n| id   | ts1                 | ts2                 |\n+------+---------------------+---------------------+\n|    1 | 2013-07-22 15:35:07 | 0000-00-00 00:00:00 |\n|    2 | 2013-07-22 15:35:07 | 0000-00-00 00:00:00 |\n+------+---------------------+---------------------+\n\nDESC t3;\n+-------+-----------+------+-----+---------------------+-----------------------\n-----+\n| Field | Type      | Null | Key | Default             | Extra                \n   |\n+-------+-----------+------+-----+---------------------+-----------------------\n-----+\n| id    | int(11)   | YES  |     | NULL                |                      \n   |\n| ts1   | timestamp | NO   |     | CURRENT_TIMESTAMP   | on update\nCURRENT_TIMESTAMP |\n| ts2   | timestamp | NO   |     | 0000-00-00 00:00:00 |                      \n   |\n+-------+-----------+------+-----+---------------------+-----------------------\n-----+\n\nExplicitly setting a timestamp with the CURRENT_TIMESTAMP function:\n\nINSERT INTO t3(id,ts2)  VALUES (3,CURRENT_TIMESTAMP());\n\nSELECT * FROM t3;\n+------+---------------------+---------------------+\n| id   | ts1                 | ts2                 |\n+------+---------------------+---------------------+\n|    1 | 2013-07-22 15:35:07 | 0000-00-00 00:00:00 |\n|    2 | 2013-07-22 15:35:07 | 0000-00-00 00:00:00 |\n|    3 | 2013-07-22 15:38:52 | 2013-07-22 15:38:52 |\n+------+---------------------+---------------------+\n\nSpecifying the timestamp as NOT NULL:') WHERE help_topic_id = 286;
update help_topic set description = CONCAT(description, '\n\nCREATE TABLE t4 (id INT, ts TIMESTAMP NOT NULL);\n\nINSERT INTO t4(id)  VALUES (1);\nSELECT SLEEP(1);\nINSERT INTO t4(id,ts) VALUES (2,NULL);\n\nSELECT * FROM t4;\n\nURL: https://mariadb.com/kb/en/timestamp/') WHERE help_topic_id = 286;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (287,23,'YEAR Data Type','Syntax\n------\n\nYEAR[(4)]\n\nDescription\n-----------\n\nA year in two-digit or four-digit format. The default is four-digit format.\nNote that the two-digit format has been deprecated since MariaDB 5.5.27.\n\nIn four-digit format, the allowable values are 1901 to 2155, and 0000. In\ntwo-digit format, the allowable values are 70 to 69, representing years from\n1970 to 2069. MariaDB displays YEAR values in YYYY format, but allows you to\nassign values to YEAR columns using either strings or numbers.\n\nInserting numeric zero has a different result for YEAR(4) and YEAR(2). For\nYEAR(2), the value 00 reflects the year 2000. For YEAR(4), the value 0000\nreflects the year zero. This only applies to numeric zero. String zero always\nreflects the year 2000.\n\nExamples\n--------\n\nAccepting a string or a number:\n\nCREATE TABLE y(y YEAR);\n\nINSERT INTO y VALUES (1990),(\'2012\');\n\nSELECT * FROM y;\n+------+\n| y    |\n+------+\n| 1990 |\n| 2012 |\n+------+\n\nWith strict_mode set, the default from MariaDB 10.2.4:\n\nOut of range:\n\nINSERT INTO y VALUES (1005),(\'3080\');\nERROR 1264 (22003): Out of range value for column \'y\' at row 1\n\nINSERT INTO y VALUES (\'2013-12-12\');\nERROR 1265 (01000): Data truncated for column \'y\' at row 1\n\nSELECT * FROM y;\n+------+\n| y    |\n+------+\n| 1990 |\n| 2012 |\n+------+\n\nWith strict_mode unset, the default until MariaDB 10.2.3:\n\nOut of range:\n\nINSERT INTO y VALUES (1005),(\'3080\');\nQuery OK, 2 rows affected, 2 warnings (0.05 sec)\nRecords: 2  Duplicates: 0  Warnings: 2\n\nSHOW WARNINGS;\n+---------+------+--------------------------------------------+\n| Level   | Code | Message                                    |\n+---------+------+--------------------------------------------+\n| Warning | 1264 | Out of range value for column \'y\' at row 1 |\n| Warning | 1264 | Out of range value for column \'y\' at row 2 |\n+---------+------+--------------------------------------------+\n\nSELECT * FROM y;\n+------+\n| y    |\n+------+\n| 1990 |\n| 2012 |\n| 0000 |\n| 0000 |\n+------+\n\nTruncating:\n\nINSERT INTO y VALUES (\'2013-12-12\');\nQuery OK, 1 row affected, 1 warning (0.05 sec)\n\nSHOW WARNINGS;\n+---------+------+----------------------------------------+\n| Level   | Code | Message                                |\n+---------+------+----------------------------------------+\n| Warning | 1265 | Data truncated for column \'y\' at row 1 |\n+---------+------+----------------------------------------+\n\nSELECT * FROM y;\n+------+\n| y    |\n+------+\n| 1990 |\n| 2012 |\n| 0000 |\n| 0000 |\n| 2013 |\n+------+\n\nDifference between YEAR(2) and YEAR(4), and string and numeric zero:\n\nCREATE TABLE y2(y YEAR(4), y2 YEAR(2));\nQuery OK, 0 rows affected, 1 warning (0.40 sec)\n\nNote (Code 1287): \'YEAR(2)\' is deprecated and will be removed in a future\nrelease. \n Please use YEAR(4) instead\n\nINSERT INTO y2 VALUES(0,0),(\'0\',\'0\');\n\nSELECT YEAR(y),YEAR(y2) FROM y2;\n+---------+----------+\n| YEAR(y) | YEAR(y2) |\n+---------+----------+\n|       0 |     2000 |\n|    2000 |     2000 |\n+---------+----------+\n\nURL: https://mariadb.com/kb/en/year-data-type/','','https://mariadb.com/kb/en/year-data-type/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (288,23,'AUTO_INCREMENT','Description\n-----------\n\nThe AUTO_INCREMENT attribute can be used to generate a unique identity for new\nrows. When you insert a new record to the table (or upon adding an\nAUTO_INCREMENT attribute with the ALTER TABLE statement), and the\nauto_increment field is NULL or DEFAULT (in the case of an INSERT), the value\nwill automatically be incremented. This also applies to 0, unless the\nNO_AUTO_VALUE_ON_ZERO SQL_MODE is enabled.\n\nAUTO_INCREMENT columns start from 1 by default. The automatically generated\nvalue can never be lower than 0.\n\nEach table can have only one AUTO_INCREMENT column. It must defined as a key\n(not necessarily the PRIMARY KEY or UNIQUE key). In some storage engines\n(including the default InnoDB), if the key consists of multiple columns, the\nAUTO_INCREMENT column must be the first column. Storage engines that permit\nthe column to be placed elsewhere are Aria, MyISAM, MERGE, Spider, TokuDB,\nBLACKHOLE, FederatedX and Federated.\n\nCREATE TABLE animals (\n  id MEDIUMINT NOT NULL AUTO_INCREMENT,\n  name CHAR(30) NOT NULL,\n  PRIMARY KEY (id)\n );\n\nINSERT INTO animals (name) VALUES\n  (\'dog\'),(\'cat\'),(\'penguin\'),\n  (\'fox\'),(\'whale\'),(\'ostrich\');\n\nSELECT * FROM animals;\n+----+---------+\n| id | name    |\n+----+---------+\n|  1 | dog     |\n|  2 | cat     |\n|  3 | penguin |\n|  4 | fox     |\n|  5 | whale   |\n|  6 | ostrich |\n+----+---------+\n\nSERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE.\n\nCREATE TABLE t (id SERIAL, c CHAR(1)) ENGINE=InnoDB;\n\nSHOW CREATE TABLE t \\G\n*************************** 1. row ***************************\n   Table: t\nCreate Table: CREATE TABLE `t` (\n `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,\n `c` char(1) DEFAULT NULL,\n UNIQUE KEY `id` (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nSetting or Changing the Auto_Increment Value\n--------------------------------------------\n\nYou can use an ALTER TABLE statement to assign a new value to the\nauto_increment table option, or set the insert_id server system variable to\nchange the next AUTO_INCREMENT value inserted by the current session.\n\nLAST_INSERT_ID() can be used to see the last AUTO_INCREMENT value inserted by\nthe current session.\n\nALTER TABLE animals AUTO_INCREMENT=8;\n\nINSERT INTO animals (name) VALUES (\'aardvark\');\n\nSELECT * FROM animals;\n+----+-----------+\n| id | name      |\n+----+-----------+\n|  1 | dog       |\n|  2 | cat       |\n|  3 | penguin   |\n|  4 | fox       |\n|  5 | whale     |\n|  6 | ostrich   |\n|  8 | aardvark  |\n+----+-----------+\n\nSET insert_id=12;\n\nINSERT INTO animals (name) VALUES (\'gorilla\');\n\nSELECT * FROM animals;\n+----+-----------+\n| id | name      |\n+----+-----------+\n|  1 | dog       |\n|  2 | cat       |\n|  3 | penguin   |\n|  4 | fox       |\n|  5 | whale     |\n|  6 | ostrich   |\n|  8 | aardvark  |\n| 12 | gorilla   |\n+----+-----------+\n\nInnoDB\n------\n\nUntil MariaDB 10.2.3, InnoDB used an auto-increment counter that is stored in\nmemory. When the server restarts, the counter is re-initialized to the highest\nvalue used in the table, which cancels the effects of any AUTO_INCREMENT = N\noption in the table statements.\n\nFrom MariaDB 10.2.4, this restriction has been lifted and AUTO_INCREMENT is\npersistent.\n\nSee also AUTO_INCREMENT Handling in InnoDB.\n\nSetting Explicit Values\n-----------------------\n\nIt is possible to specify a value for an AUTO_INCREMENT column. If the key is\nprimary or unique, the value must not already exist in the key.\n\nIf the new value is higher than the current maximum value, the AUTO_INCREMENT\nvalue is updated, so the next value will be higher. If the new value is lower\nthan the current maximum value, the AUTO_INCREMENT value remains unchanged.\n\nThe following example demonstrates these behaviors:\n\nCREATE TABLE t (id INTEGER UNSIGNED AUTO_INCREMENT PRIMARY KEY) ENGINE =\nInnoDB;\n\nINSERT INTO t VALUES (NULL);\nSELECT id FROM t;\n+----+\n| id |\n+----+\n|  1 |\n+----+\n\nINSERT INTO t VALUES (10); -- higher value\nSELECT id FROM t;\n+----+\n| id |\n+----+\n|  1 |\n| 10 |\n+----+\n\nINSERT INTO t VALUES (2); -- lower value\nINSERT INTO t VALUES (NULL); -- auto value\nSELECT id FROM t;\n+----+\n| id |\n+----+\n|  1 |\n|  2 |\n| 10 |\n| 11 |\n+----+\n\nThe ARCHIVE storage engine does not allow to insert a value that is lower than\nthe current maximum.\n\nMissing Values\n--------------\n\nAn AUTO_INCREMENT column normally has missing values. This happens because if\na row is deleted, or an AUTO_INCREMENT value is explicitly updated, old values\nare never re-used. The REPLACE statement also deletes a row, and its value is\nwasted. With InnoDB, values can be reserved by a transaction; but if the\ntransaction fails (for example, because of a ROLLBACK) the reserved value will\nbe lost.\n\nThus AUTO_INCREMENT values can be used to sort results in a chronological\norder, but not to create a numeric sequence.\n\nReplication\n-----------\n\nTo make master-master or Galera safe to use AUTO_INCREMENT one should use the\nsystem variables auto_increment_increment and auto_increment_offset to\ngenerate unique values for each server.\n\nCHECK Constraints, DEFAULT Values and Virtual Columns\n-----------------------------------------------------\n\nMariaDB starting with 10.2.6\n----------------------------\nFrom MariaDB 10.2.6 auto_increment columns are no longer permitted in CHECK\nconstraints, DEFAULT value expressions and virtual columns. They were\npermitted in earlier versions, but did not work correctly. See MDEV-11117.\n','','https://mariadb.com/kb/en/auto_increment/');
update help_topic set description = CONCAT(description, '\nGenerating Auto_Increment Values When Adding the Attribute\n----------------------------------------------------------\n\nCREATE OR REPLACE TABLE t1 (a INT);\nINSERT t1 VALUES (0),(0),(0);\nALTER TABLE t1 MODIFY a INT NOT NULL AUTO_INCREMENT PRIMARY KEY;\nSELECT * FROM t1;\n+---+\n| a |\n+---+\n| 1 |\n| 2 |\n| 3 |\n+---+\n\nCREATE OR REPLACE TABLE t1 (a INT);\nINSERT t1 VALUES (5),(0),(8),(0);\nALTER TABLE t1 MODIFY a INT NOT NULL AUTO_INCREMENT PRIMARY KEY;\nSELECT * FROM t1;\n+---+\n| a |\n+---+\n| 5 |\n| 6 |\n| 8 |\n| 9 |\n+---+\n\nIf the NO_AUTO_VALUE_ON_ZERO SQL_MODE is set, zero values will not be\nautomatically incremented:\n\nSET SQL_MODE=\'no_auto_value_on_zero\';\nCREATE OR REPLACE TABLE t1 (a INT);\nINSERT t1 VALUES (3), (0);\nALTER TABLE t1 MODIFY a INT NOT NULL AUTO_INCREMENT PRIMARY KEY;\nSELECT * FROM t1;\n+---+\n| a |\n+---+\n| 0 |\n| 3 |\n+---+\n\nURL: https://mariadb.com/kb/en/auto_increment/') WHERE help_topic_id = 288;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (289,24,'Using Compound Statements Outside of Stored Programs','Compound statements can also be used outside of stored programs.\n\ndelimiter |\nIF @have_innodb THEN\n CREATE TABLE IF NOT EXISTS innodb_index_stats (\n  database_name    VARCHAR(64) NOT NULL,\n  table_name       VARCHAR(64) NOT NULL,\n  index_name       VARCHAR(64) NOT NULL,\n  last_update      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE\nCURRENT_TIMESTAMP,\n  stat_name        VARCHAR(64) NOT NULL,\n  stat_value       BIGINT UNSIGNED NOT NULL,\n  sample_size      BIGINT UNSIGNED,\n  stat_description VARCHAR(1024) NOT NULL,\n  PRIMARY KEY (database_name, table_name, index_name, stat_name)\n ) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;\nEND IF|\nQuery OK, 0 rows affected, 2 warnings (0.00 sec)\n\nNote, that using compound statements this way is subject to following\nlimitations:\n\n* Only BEGIN, IF, CASE, LOOP, WHILE, REPEAT statements may start a compound\nstatement outside of stored programs.\n* BEGIN must use the BEGIN NOT ATOMIC syntax (otherwise it\'ll be confused with\nBEGIN that starts a transaction).\n* A compound statement might not start with a label.\n* A compound statement is parsed completely—note \"2 warnings\" in the above\nexample, even if the condition was false (InnoDB was, indeed, disabled), and\nthe CREATE TABLE statement was not executed, it was still parsed and the\nparser produced \"Unknown storage engine\" warning.\n\nInside a compound block first three limitations do not apply, one can use\nanything that can be used inside a stored program — including labels,\ncondition handlers, variables, and so on:\n\nBEGIN NOT ATOMIC\n  DECLARE foo CONDITION FOR 1146;\n  DECLARE x INT DEFAULT 0;\n  DECLARE CONTINUE HANDLER FOR SET x=1;\n  INSERT INTO test.t1 VALUES (\"hndlr1\", val, 2);\n  END|\n\nExample how to use IF:\n\nIF (1>0) THEN BEGIN NOT ATOMIC SELECT 1; END ; END IF;;\n\nExample of how to use WHILE loop:\n\nDELIMITER |\nBEGIN NOT ATOMIC\n  DECLARE x INT DEFAULT 0;\n  WHILE x <= 10 DO\n    SET x = x + 1;\n    SELECT x;\n  END WHILE;\nEND|\nDELIMITER ;\n\nURL:\nhttps://mariadb.com/kb/en/using-compound-statements-outside-of-stored-programs/','','https://mariadb.com/kb/en/using-compound-statements-outside-of-stored-programs/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (290,24,'BEGIN END','Syntax\n------\n\n[begin_label:] BEGIN [NOT ATOMIC]\n  [statement_list]\nEND [end_label]\n\nNOT ATOMIC is required when used outside of a stored procedure. Inside stored\nprocedures or within an anonymous block, BEGIN alone starts a new anonymous\nblock.\n\nDescription\n-----------\n\nBEGIN ... END syntax is used for writing compound statements. A compound\nstatement can contain multiple statements, enclosed by the BEGIN and END\nkeywords. statement_list represents a list of one or more statements, each\nterminated by a semicolon (i.e., ;) statement delimiter. statement_list is\noptional, which means that the empty compound statement (BEGIN END) is legal.\n\nNote that END will perform a commit. If you are running in autocommit mode,\nevery statement will be committed separately. If you are not running in\nautocommit mode, you must execute a COMMIT or ROLLBACK after END to get the\ndatabase up to date.\n\nUse of multiple statements requires that a client is able to send statement\nstrings containing the ; statement delimiter. This is handled in the mysql\ncommand-line client with the DELIMITER command. Changing the ;\nend-of-statement delimiter (for example, to //) allows ; to be used in a\nprogram body.\n\nA compound statement within a stored program can be labeled. end_label cannot\nbe given unless begin_label also is present. If both are present, they must be\nthe same.\n\nBEGIN ... END constructs can be nested. Each block can define its own\nvariables, a CONDITION, a HANDLER and a CURSOR, which don\'t exist in the outer\nblocks. The most local declarations override the outer objects which use the\nsame name (see example below).\n\nThe declarations order is the following:\n\n* DECLARE local variables;\n* DECLARE CONDITIONs;\n* DECLARE CURSORs;\n* DECLARE HANDLERs;\n\nNote that DECLARE HANDLER contains another BEGIN ... END construct.\n\nHere is an example of a very simple, anonymous block:\n\nBEGIN NOT ATOMIC\nSET @a=1;\nCREATE TABLE test.t1(a INT);\nEND|\n\nBelow is an example of nested blocks in a stored procedure:\n\nCREATE PROCEDURE t( )\nBEGIN\n DECLARE x TINYINT UNSIGNED DEFAULT 1;\n BEGIN\n   DECLARE x CHAR(2) DEFAULT \'02\';\n   DECLARE y TINYINT UNSIGNED DEFAULT 10;\n   SELECT x, y;\n END;\n SELECT x;\nEND;\n\nIn this example, a TINYINT variable, x is declared in the outter block. But in\nthe inner block x is re-declared as a CHAR and an y variable is declared. The\ninner SELECT shows the \"new\" value of x, and the value of y. But when x is\nselected in the outer block, the \"old\" value is returned. The final SELECT\ndoesn\'t try to read y, because it doesn\'t exist in that context.\n\nURL: https://mariadb.com/kb/en/begin-end/','','https://mariadb.com/kb/en/begin-end/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (291,24,'CASE Statement','Syntax\n------\n\nCASE case_value\n  WHEN when_value THEN statement_list\n  [WHEN when_value THEN statement_list] ...\n  [ELSE statement_list]\nEND CASE\n\nOr:\n\nCASE\n  WHEN search_condition THEN statement_list\n  [WHEN search_condition THEN statement_list] ...\n  [ELSE statement_list]\nEND CASE\n\nDescription\n-----------\n\nThe text on this page describes the CASE statement for stored programs. See\nthe CASE OPERATOR for details on the CASE operator outside of stored programs.\n\nThe CASE statement for stored programs implements a complex conditional\nconstruct. If a search_condition evaluates to true, the corresponding SQL\nstatement list is executed. If no search condition matches, the statement list\nin the ELSE clause is executed. Each statement_list consists of one or more\nstatements.\n\nThe CASE statement cannot have an ELSE NULL clause, and it is terminated with\nEND CASE instead of END. implements a complex conditional construct. If a\nsearch_condition evaluates to true, the corresponding SQL statement list is\nexecuted. If no search condition matches, the statement list in the ELSE\nclause is executed. Each statement_list consists of one or more statements.\n\nIf no when_value or search_condition matches the value tested and the CASE\nstatement contains no ELSE clause, a Case not found for CASE statement error\nresults.\n\nEach statement_list consists of one or more statements; an empty\nstatement_list is not allowed. To handle situations where no value is matched\nby any WHEN clause, use an ELSE containing an empty BEGIN ... END block, as\nshown in this example:\n\nDELIMITER |\nCREATE PROCEDURE p()\nBEGIN\n DECLARE v INT DEFAULT 1;\n CASE v\n  WHEN 2 THEN SELECT v;\n  WHEN 3 THEN SELECT 0;\n  ELSE BEGIN END;\n END CASE;\nEND;\n|\n\nThe indentation used here in the ELSE clause is for purposes of clarity only,\nand is not otherwise significant. See Delimiters in the mysql client for more\non the use of the delimiter command.\n\nNote: The syntax of the CASE statement used inside stored programs differs\nslightly from that of the SQL CASE expression described in CASE OPERATOR. The\nCASE statement cannot have an ELSE NULL clause, and it is terminated with END\nCASE instead of END.\n\nURL: https://mariadb.com/kb/en/case-statement/','','https://mariadb.com/kb/en/case-statement/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (292,24,'DECLARE CONDITION','Syntax\n------\n\nDECLARE condition_name CONDITION FOR condition_value\n\ncondition_value:\n  SQLSTATE [VALUE] sqlstate_value\n | mysql_error_code\n\nDescription\n-----------\n\nThe DECLARE ... CONDITION statement defines a named error condition. It\nspecifies a condition that needs specific handling and associates a name with\nthat condition. Later, the name can be used in a DECLARE ... HANDLER, SIGNAL\nor RESIGNAL statement (as long as the statement is located in the same BEGIN\n... END block).\n\nConditions must be declared after local variables, but before CURSORs and\nHANDLERs.\n\nA condition_value for DECLARE ... CONDITION can be an SQLSTATE value (a\n5-character string literal) or a MySQL error code (a number). You should not\nuse SQLSTATE value \'00000\' or MySQL error code 0, because those indicate\nsucess rather than an error condition. If you try, or if you specify an\ninvalid SQLSTATE value, an error like this is produced:\n\nERROR 1407 (42000): Bad SQLSTATE: \'00000\'\n\nFor a list of SQLSTATE values and MariaDB error codes, see MariaDB Error Codes.\n\nURL: https://mariadb.com/kb/en/declare-condition/','','https://mariadb.com/kb/en/declare-condition/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (293,24,'DECLARE HANDLER','Syntax\n------\n\nDECLARE handler_type HANDLER\n  FOR condition_value [, condition_value] ...\n  statement\n\nhandler_type:\n  CONTINUE\n | EXIT\n | UNDO\n\ncondition_value:\n  SQLSTATE [VALUE] sqlstate_value\n | condition_name\n | SQLWARNING\n | NOT FOUND\n | SQLEXCEPTION\n | mariadb_error_code\n\nDescription\n-----------\n\nThe DECLARE ... HANDLER statement specifies handlers that each may deal with\none or more conditions. If one of these conditions occurs, the specified\nstatement is executed. statement can be a simple statement (for example, SET\nvar_name = value), or it can be a compound statement written using BEGIN and\nEND.\n\nHandlers must be declared after local variables, a CONDITION and a CURSOR.\n\nFor a CONTINUE handler, execution of the current program continues after\nexecution of the handler statement. For an EXIT handler, execution terminates\nfor the BEGIN ... END compound statement in which the handler is declared.\n(This is true even if the condition occurs in an inner block.) The UNDO\nhandler type statement is not supported.\n\nIf a condition occurs for which no handler has been declared, the default\naction is EXIT.\n\nA condition_value for DECLARE ... HANDLER can be any of the following values:\n\n* An SQLSTATE value (a 5-character string literal) or a MariaDB error\ncode (a number). You should not use SQLSTATE value \'00000\' or MariaDB\nerror code 0, because those indicate sucess rather than an error\ncondition. For a list of SQLSTATE values and MariaDB error codes, see\nMariaDB Error Codes.\n* A condition name previously specified with DECLARE ... CONDITION. It must be\nin the same stored program. See DECLARE CONDITION.\n* SQLWARNING is shorthand for the class of SQLSTATE values that begin\nwith \'01\'.\n* NOT FOUND is shorthand for the class of SQLSTATE values that begin\nwith \'02\'. This is relevant only the context of cursors and is used to\ncontrol what happens when a cursor reaches the end of a data set. If\nno more rows are available, a No Data condition occurs with SQLSTATE\nvalue 02000. To detect this condition, you can set up a handler for it\n(or for a NOT FOUND condition). An example is shown in Cursor Overview. This\ncondition also occurs for SELECT ... INTO var_list statements that retrieve no\nrows.\n* SQLEXCEPTION is shorthand for the class of SQLSTATE values that do\nnot begin with \'00\', \'01\', or \'02\'.\n\nWhen an error raises, in some cases it could be handled by multiple HANDLERs.\nFor example, there may be an handler for 1050 error, a separate handler for\nthe 42S01 SQLSTATE, and another separate handler for the SQLEXCEPTION class:\nin theory all occurrences of HANDLER may catch the 1050 error, but MariaDB\nchooses the HANDLER with the highest precedence. Here are the precedence rules:\n\n* Handlers which refer to an error code have the highest precedence.\n* Handlers which refer to a SQLSTATE come next.\n* Handlers which refer to an error class have the lowest precedence.\n\nIn some cases, a statement could produce multiple errors. If this happens, in\nsome cases multiple handlers could have the highest precedence. In such cases,\nthe choice of the handler is indeterminate.\n\nNote that if an error occurs within a CONTINUE HANDLER block, it can be\nhandled by another HANDLER. However, a HANDLER which is already in the stack\n(that is, it has been called to handle an error and its execution didn\'t\nfinish yet) cannot handle new errors—this prevents endless loops. For example,\nsuppose that a stored procedure contains a CONTINUE HANDLER for SQLWARNING and\nanother CONTINUE HANDLER for NOT FOUND. At some point, a NOT FOUND error\noccurs, and the execution enters the NOT FOUND HANDLER. But within that\nhandler, a warning occurs, and the execution enters the SQLWARNING HANDLER. If\nanother NOT FOUND error occurs, it cannot be handled again by the NOT FOUND\nHANDLER, because its execution is not finished.\n\nWhen a DECLARE HANDLER block can handle more than one error condition, it may\nbe useful to know which errors occurred. To do so, you can use the GET\nDIAGNOSTICS statement.\n\nAn error that is handled by a DECLARE HANDLER construct can be issued again\nusing the RESIGNAL statement.\n\nBelow is an example using DECLARE HANDLER:\n\nCREATE TABLE test.t (s1 INT, PRIMARY KEY (s1));\n\nDELIMITER //\n\nCREATE PROCEDURE handlerdemo ( )\n  BEGIN\n   DECLARE CONTINUE HANDLER FOR SQLSTATE \'23000\' SET @x2 = 1;\n   SET @x = 1;\n   INSERT INTO test.t VALUES (1);\n   SET @x = 2;\n   INSERT INTO test.t VALUES (1);\n   SET @x = 3;\n  END;\n  //\n\nDELIMITER ;\n\nCALL handlerdemo( );\n\nSELECT @x;\n+------+\n| @x   |\n+------+\n|    3 |\n+------+\n\nURL: https://mariadb.com/kb/en/declare-handler/','','https://mariadb.com/kb/en/declare-handler/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (294,24,'DECLARE Variable','Syntax\n------\n\nDECLARE var_name [, var_name] ... [[ROW] TYPE OF]] type [DEFAULT value]\n\nDescription\n-----------\n\nThis statement is used to declare local variables within stored programs. To\nprovide a default value for the variable, include a DEFAULT clause. The value\ncan be specified as an expression (even subqueries are permitted); it need not\nbe a constant. If the DEFAULT clause is missing, the initial value is NULL.\n\nLocal variables are treated like stored routine parameters with respect to\ndata type and overflow checking. See CREATE PROCEDURE.\n\nLocal variables must be declared before CONDITIONs, CURSORs and HANDLERs.\n\nLocal variable names are not case sensitive.\n\nThe scope of a local variable is within the BEGIN ... END block where it is\ndeclared. The variable can be referred to in blocks nested within the\ndeclaring block, except those blocks that declare a variable with the same\nname.\n\nTYPE OF / ROW TYPE OF\n---------------------\n\nMariaDB starting with 10.3\n--------------------------\nTYPE OF and ROW TYPE OF anchored data types for stored routines were\nintroduced in MariaDB 10.3.\n\nAnchored data types allow a data type to be defined based on another object,\nsuch as a table row, rather than specifically set in the declaration. If the\nanchor object changes, so will the anchored data type. This can lead to\nroutines being easier to maintain, so that if the data type in the table is\nchanged, it will automatically be changed in the routine as well.\n\nVariables declared with ROW TYPE OF will have the same features as implicit\nROW variables. It is not possible to use ROW TYPE OF variables in a LIMIT\nclause.\n\nThe real data type of TYPE OF and ROW TYPE OF table_name will become known at\nthe very beginning of the stored routine call. ALTER TABLE or DROP TABLE\nstatements performed inside the current routine on the tables that appear in\nanchors won\'t affect the data type of the anchored variables, even if the\nvariable is declared after an ALTER TABLE or DROP TABLE statement.\n\nThe real data type of a ROW TYPE OF cursor_name variable will become known\nwhen execution enters into the block where the variable is declared. Data type\ninstantiation will happen only once. In a cursor ROW TYPE OF variable that is\ndeclared inside a loop, its data type will become known on the very first\niteration and won\'t change on further loop iterations.\n\nThe tables referenced in TYPE OF and ROW TYPE OF declarations will be checked\nfor existence at the beginning of the stored routine call. CREATE PROCEDURE or\nCREATE FUNCTION will not check the referenced tables for existence.\n\nExamples\n--------\n\nTYPE OF and ROW TYPE OF from MariaDB 10.3:\n\nDECLARE tmp TYPE OF t1.a; -- Get the data type from the column {{a}} in the\ntable {{t1}}\n\nDECLARE rec1 ROW TYPE OF t1; -- Get the row data type from the table {{t1}}\n\nDECLARE rec2 ROW TYPE OF cur1; -- Get the row data type from the cursor\n{{cur1}}\n\nURL: https://mariadb.com/kb/en/declare-variable/','','https://mariadb.com/kb/en/declare-variable/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (295,24,'FOR','MariaDB starting with 10.3\n--------------------------\nFOR loops were introduced in MariaDB 10.3.\n\nSyntax\n------\n\nInteger range FOR loop:\n\n[begin_label:]\nFOR var_name IN [ REVERSE ] lower_bound .. upper_bound\nDO statement_list\nEND FOR [ end_label ]\n\nExplicit cursor FOR loop\n\n[begin_label:]\nFOR record_name IN cursor_name [ ( cursor_actual_parameter_list)]\nDO statement_list\nEND FOR [ end_label ]\n\nExplicit cursor FOR loop (Oracle mode)\n\n[begin_label:]\nFOR record_name IN cursor_name [ ( cursor_actual_parameter_list)]\nLOOP\n statement_list\nEND LOOP [ end_label ]\n\nImplicit cursor FOR loop\n\n[begin_label:]\nFOR record_name IN ( select_statement )\nDO statement_list\nEND FOR [ end_label ]\n\nDescription\n-----------\n\nFOR loops allow code to be executed a fixed number of times.\n\nIn an integer range FOR loop, MariaDB will compare the lower bound and upper\nbound values, and assign the lower bound value to a counter. If REVERSE is not\nspecified, and the upper bound value is greater than or equal to the counter,\nthe counter will be incremented and the statement will continue, after which\nthe loop is entered again. If the upper bound value is greater than the\ncounter, the loop will be exited.\n\nIf REVERSE is specified, the counter is decremented, and the upper bound value\nneeds to be less than or equal for the loop to continue.\n\nExamples\n--------\n\nIntger range FOR loop:\n\nCREATE TABLE t1 (a INT);\n\nDELIMITER //\n\nFOR i IN 1..3\nDO\n INSERT INTO t1 VALUES (i);\nEND FOR;\n//\n\nDELIMITER ;\n\nSELECT * FROM t1;\n+------+\n| a    |\n+------+\n|    1 |\n|    2 |\n|    3 |\n+------+\n\nREVERSE integer range FOR loop:\n\nCREATE OR REPLACE TABLE t1 (a INT);\n\nDELIMITER //\nFOR i IN REVERSE 4..12\n  DO\n  INSERT INTO t1 VALUES (i);\nEND FOR;\n//\nQuery OK, 9 rows affected (0.422 sec)\n\nDELIMITER ;\n\nSELECT * FROM t1;\n+------+\n| a    |\n+------+\n|   12 |\n|   11 |\n|   10 |\n|    9 |\n|    8 |\n|    7 |\n|    6 |\n|    5 |\n|    4 |\n+------+\n\nExplicit cursor in Oracle mode:\n\nSET sql_mode=ORACLE;\n\nCREATE OR REPLACE TABLE t1 (a INT, b VARCHAR(32));\n\nINSERT INTO t1 VALUES (10,\'b0\');\nINSERT INTO t1 VALUES (11,\'b1\');\nINSERT INTO t1 VALUES (12,\'b2\');\n\nDELIMITER //\n\nCREATE OR REPLACE PROCEDURE p1(pa INT) AS \n CURSOR cur(va INT) IS\n  SELECT a, b FROM t1 WHERE a=va;\nBEGIN\n FOR rec IN cur(pa)\n LOOP\n  SELECT rec.a, rec.b;\n END LOOP;\nEND;\n//\n\nDELIMITER ;\n\nCALL p1(10);\n+-------+-------+\n| rec.a | rec.b |\n+-------+-------+\n|    10 | b0    |\n+-------+-------+\n\nCALL p1(11);\n+-------+-------+\n| rec.a | rec.b |\n+-------+-------+\n|    11 | b1    |\n+-------+-------+\n\nCALL p1(12);\n+-------+-------+\n| rec.a | rec.b |\n+-------+-------+\n|    12 | b2    |\n+-------+-------+\n\nCALL p1(13);\nQuery OK, 0 rows affected (0.000 sec)\n\nURL: https://mariadb.com/kb/en/for/','','https://mariadb.com/kb/en/for/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (296,24,'GOTO','MariaDB starting with 10.3\n--------------------------\nThe GOTO statement was introduced in MariaDB 10.3 for Oracle compatibility.\n\nSyntax\n------\n\nGOTO label\n\nDescription\n-----------\n\nThe GOTO statement causes the code to jump to the specified label, and\ncontinue operating from there. It is only accepted when in Oracle mode.\n\nExample\n-------\n\nSET sql_mode=ORACLE;\n\nDELIMITER //\n\nCREATE OR REPLACE PROCEDURE p1 AS\n\nBEGIN\n\nSELECT 1;\n GOTO label;\n SELECT 2;\n <<label>>\n SELECT 3;\n\nEND;\n\n//\n\nDELIMITER\n\ncall p1();\n+---+\n| 1 |\n+---+\n| 1 |\n+---+\n1 row in set (0.000 sec)\n\n+---+\n| 3 |\n+---+\n| 3 |\n+---+\n1 row in set (0.000 sec)\n\nURL: https://mariadb.com/kb/en/goto/','','https://mariadb.com/kb/en/goto/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (297,24,'IF','Syntax\n------\n\nIF search_condition THEN statement_list\n  [ELSEIF search_condition THEN statement_list] ...\n  [ELSE statement_list]\nEND IF;\n\nDescription\n-----------\n\nIF implements a basic conditional construct. If the search_condition evaluates\nto true, the corresponding SQL statement list is executed. If no\nsearch_condition matches, the statement list in the ELSE clause is executed.\nEach statement_list consists of one or more statements.\n\nURL: https://mariadb.com/kb/en/if/','','https://mariadb.com/kb/en/if/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (298,24,'ITERATE','Syntax\n------\n\nITERATE label\n\nITERATE can appear only within LOOP, REPEAT, and WHILE statements. ITERATE\nmeans \"do the loop again\", and uses the statement\'s label to determine which\nstatements to repeat. The label must be in the same stored program, not in a\ncaller procedure.\n\nIf you try to use ITERATE with a non-existing label, or if the label is\nassociated to a construct which is not a loop, the following error will be\nproduced:\n\nERROR 1308 (42000): ITERATE with no matching label: <label_name>\n\nBelow is an example of how ITERATE might be used:\n\nCREATE PROCEDURE doiterate(p1 INT)\nBEGIN\n label1: LOOP\n  SET p1 = p1 + 1;\n  IF p1 < 10 THEN ITERATE label1; END IF;\n  LEAVE label1;\n END LOOP label1;\n SET @x = p1;\nEND\n\nURL: https://mariadb.com/kb/en/iterate/','','https://mariadb.com/kb/en/iterate/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (299,24,'Labels','Syntax\n------\n\nlabel: <construct>\n[label]\n\nLabels are MariaDB identifiers which can be used to identify a BEGIN ... END\nconstruct or a loop. They have a maximum length of 16 characters and can be\nquoted with backticks (i.e.., `).\n\nLabels have a start part and an end part. The start part must precede the\nportion of code it refers to, must be followed by a colon (:) and can be on\nthe same or different line. The end part is optional and adds nothing, but can\nmake the code more readable. If used, the end part must precede the\nconstruct\'s delimiter (;). Constructs identified by a label can be nested.\nEach construct can be identified by only one label.\n\nLabels need not be unique in the stored program they belong to. However, a\nlabel for an inner loop cannot be identical to a label for an outer loop. In\nthis case, the following error would be produced:\n\nERROR 1309 (42000): Redefining label <label_name>\n\nLEAVE and ITERATE statements can be used to exit or repeat a portion of code\nidentified by a label. They must be in the same Stored Routine, Trigger or\nEvent which contains the target label.\n\nBelow is an example using a simple label that is used to exit a LOOP:\n\nCREATE PROCEDURE `test_sp`()\nBEGIN\n `my_label`:\n LOOP\n   SELECT \'looping\';\n   LEAVE `my_label`;\n END LOOP;\n SELECT \'out of loop\';\nEND;\n\nThe following label is used to exit a procedure, and has an end part:\n\nCREATE PROCEDURE `test_sp`()\n`my_label`:\nBEGIN\n IF @var = 1 THEN\n   LEAVE `my_label`;\n END IF;\n DO something();\nEND `my_label`;\n\nURL: https://mariadb.com/kb/en/labels/','','https://mariadb.com/kb/en/labels/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (300,24,'LEAVE','Syntax\n------\n\nLEAVE label\n\nThis statement is used to exit the flow control construct that has the given\nlabel. The label must be in the same stored program, not in a caller\nprocedure. LEAVE can be used within BEGIN ... END or loop constructs (LOOP,\nREPEAT, WHILE). In Stored Procedures, Triggers and Events, LEAVE can refer to\nthe outmost BEGIN ... END construct; in that case, the program exits the\nprocedure. In Stored Functions, RETURN can be used instead.\n\nNote that LEAVE cannot be used to exit a DECLARE HANDLER block.\n\nIf you try to LEAVE a non-existing label, or if you try to LEAVE a HANDLER\nblock, the following error will be produced:\n\nERROR 1308 (42000): LEAVE with no matching label: <label_name>\n\nThe following example uses LEAVE to exit the procedure if a condition is true:\n\nCREATE PROCEDURE proc(IN p TINYINT)\nCONTAINS SQL\n`whole_proc`:\nBEGIN\n SELECT 1;\n IF p < 1 THEN\n   LEAVE `whole_proc`;\n END IF;\n SELECT 2;\nEND;\n\nCALL proc(0);\n+---+\n| 1 |\n+---+\n| 1 |\n+---+\n\nURL: https://mariadb.com/kb/en/leave/','','https://mariadb.com/kb/en/leave/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (301,24,'LOOP','Syntax\n------\n\n[begin_label:] LOOP\n  statement_list\nEND LOOP [end_label]\n\nDescription\n-----------\n\nLOOP implements a simple loop construct, enabling repeated execution of the\nstatement list, which consists of one or more statements, each terminated by a\nsemicolon (i.e., ;) statement delimiter. The statements within the loop are\nrepeated until the loop is exited; usually this is accomplished with a LEAVE\nstatement.\n\nA LOOP statement can be labeled. end_label cannot be given unless begin_label\nalso is present. If both are present, they must be the same.\n\nSee Delimiters in the mysql client for more on delimiter usage in the client.\n\nURL: https://mariadb.com/kb/en/loop/','','https://mariadb.com/kb/en/loop/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (302,24,'REPEAT LOOP','Syntax\n------\n\n[begin_label:] REPEAT\n  statement_list\nUNTIL search_condition\nEND REPEAT [end_label]\n\nThe statement list within a REPEAT statement is repeated until the\nsearch_condition is true. Thus, a REPEAT always enters the loop at least once.\nstatement_list consists of one or more statements, each terminated by a\nsemicolon (i.e., ;) statement delimiter.\n\nA REPEAT statement can be labeled. end_label cannot be given unless\nbegin_label also is present. If both are present, they must be the same.\n\nSee Delimiters in the mysql client for more on client delimiter usage.\n\nDELIMITER //\n\nCREATE PROCEDURE dorepeat(p1 INT)\n BEGIN\n  SET @x = 0;\n  REPEAT SET @x = @x + 1; UNTIL @x > p1 END REPEAT;\n END\n//\n\nCALL dorepeat(1000)//\n\nSELECT @x//\n+------+\n| @x   |\n+------+\n| 1001 |\n+------+\n\nURL: https://mariadb.com/kb/en/repeat-loop/','','https://mariadb.com/kb/en/repeat-loop/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (303,24,'RESIGNAL','Syntax\n------\n\nRESIGNAL [error_condition]\n  [SET error_property\n  [, error_property] ...]\n\nerror_condition:\n  SQLSTATE [VALUE] \'sqlstate_value\'\n | condition_name\n\nerror_property:\n  error_property_name = <error_property_value>\n\nerror_property_name:\n  CLASS_ORIGIN\n | SUBCLASS_ORIGIN\n | MESSAGE_TEXT\n | MYSQL_ERRNO\n | CONSTRAINT_CATALOG\n | CONSTRAINT_SCHEMA\n | CONSTRAINT_NAME\n | CATALOG_NAME\n | SCHEMA_NAME\n | TABLE_NAME\n | COLUMN_NAME\n | CURSOR_NAME\n\nDescription\n-----------\n\nThe syntax of RESIGNAL and its semantics are very similar to SIGNAL. This\nstatement can only be used within an error HANDLER. It produces an error, like\nSIGNAL. RESIGNAL clauses are the same as SIGNAL, except that they all are\noptional, even SQLSTATE. All the properties which are not specified in\nRESIGNAL, will be identical to the properties of the error that was received\nby the error HANDLER. For a description of the clauses, see diagnostics area.\n\nNote that RESIGNAL does not empty the diagnostics area: it just appends\nanother error condition.\n\nRESIGNAL, without any clauses, produces an error which is identical to the\nerror that was received by HANDLER.\n\nIf used out of a HANDLER construct, RESIGNAL produces the following error:\n\nERROR 1645 (0K000): RESIGNAL when handler not active\n\nIn MariaDB 5.5, if a HANDLER contained a CALL to another procedure, that\nprocedure could use RESIGNAL. Since MariaDB 10.0, trying to do this raises the\nabove error.\n\nFor a list of SQLSTATE values and MariaDB error codes, see MariaDB Error Codes.\n\nThe following procedure tries to query two tables which don\'t exist, producing\na 1146 error in both cases. Those errors will trigger the HANDLER. The first\ntime the error will be ignored and the client will not receive it, but the\nsecond time, the error is re-signaled, so the client will receive it.\n\nCREATE PROCEDURE test_error( )\nBEGIN\n DECLARE CONTINUE HANDLER\n   FOR 1146\n BEGIN\n IF @hide_errors IS FALSE THEN\n   RESIGNAL;\n END IF;\n END;\n SET @hide_errors = TRUE;\n SELECT \'Next error will be ignored\' AS msg;\n SELECT `c` FROM `temptab_one`;\n SELECT \'Next error won\'\'t be ignored\' AS msg;\n SET @hide_errors = FALSE;\n SELECT `c` FROM `temptab_two`;\nEND;\n\nCALL test_error( );\n\n+----------------------------+\n| msg                        |\n+----------------------------+\n| Next error will be ignored |\n+----------------------------+\n\n+-----------------------------+\n| msg                         |\n+-----------------------------+\n| Next error won\'t be ignored |\n+-----------------------------+\n\nERROR 1146 (42S02): Table \'test.temptab_two\' doesn\'t exist\n\nThe following procedure re-signals an error, modifying only the error message\nto clarify the cause of the problem.\n\nCREATE PROCEDURE test_error()\nBEGIN\n DECLARE CONTINUE HANDLER\n FOR 1146\n BEGIN\n   RESIGNAL SET\n   MESSAGE_TEXT = \'`temptab` does not exist\';\n END;\n SELECT `c` FROM `temptab`;\nEND;\n\nCALL test_error( );\nERROR 1146 (42S02): `temptab` does not exist\n\nAs explained above, this works on MariaDB 5.5, but produces a 1645 error since\n10.0.\n\nCREATE PROCEDURE handle_error()\nBEGIN\n RESIGNAL;\nEND;\nCREATE PROCEDURE p()\nBEGIN\n DECLARE EXIT HANDLER FOR SQLEXCEPTION CALL p();\n SIGNAL SQLSTATE \'45000\';\nEND;\n\nURL: https://mariadb.com/kb/en/resignal/','','https://mariadb.com/kb/en/resignal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (304,24,'RETURN','Syntax\n------\n\nRETURN expr\n\nThe RETURN statement terminates execution of a stored function and returns the\nvalue expr to the function caller. There must be at least one RETURN statement\nin a stored function. If the function has multiple exit points, all exit\npoints must have a RETURN.\n\nThis statement is not used in stored procedures, triggers, or events. LEAVE\ncan be used instead.\n\nThe following example shows that RETURN can return the result of a scalar\nsubquery:\n\nCREATE FUNCTION users_count() RETURNS BOOL\n READS SQL DATA\nBEGIN\n RETURN (SELECT COUNT(DISTINCT User) FROM mysql.user);\nEND;\n\nURL: https://mariadb.com/kb/en/return/','','https://mariadb.com/kb/en/return/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (305,24,'SELECT INTO','Syntax\n------\n\nSELECT col_name [, col_name] ...\n  INTO var_name [, var_name] ...\n  table_expr\n\nDescription\n-----------\n\nSELECT ... INTO enables selected columns to be stored directly into variables.\nNo resultset is produced. The query should return a single row. If the query\nreturns no rows, a warning with error code 1329 occurs (No data), and the\nvariable values remain unchanged. If the query returns multiple rows, error\n1172 occurs (Result consisted of more than one row). If it is possible that\nthe statement may retrieve multiple rows, you can use LIMIT 1 to limit the\nresult set to a single row.\n\nThe INTO clause can also be specified at the end of the statement.\n\nIn the context of such statements that occur as part of events executed by the\nEvent Scheduler, diagnostics messages (not only errors, but also warnings) are\nwritten to the error log, and, on Windows, to the application event log.\n\nThis statement can be used with both local variables and user-defined\nvariables.\n\nFor the complete syntax, see SELECT.\n\nAnother way to set a variable\'s value is the SET statement.\n\nSELECT ... INTO results are not stored in the query cache even if SQL_CACHE is\nspecified.\n\nExamples\n--------\n\nSELECT id, data INTO @x,@y \nFROM test.t1 LIMIT 1;\n\nURL: https://mariadb.com/kb/en/selectinto/','','https://mariadb.com/kb/en/selectinto/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (306,24,'SIGNAL','Syntax\n------\n\nSIGNAL error_condition\n  [SET error_property\n  [, error_property] ...]\n\nerror_condition:\n  SQLSTATE [VALUE] \'sqlstate_value\'\n | condition_name\n\nerror_property:\n  error_property_name = <error_property_value>\n\nerror_property_name:\n  CLASS_ORIGIN\n | SUBCLASS_ORIGIN\n | MESSAGE_TEXT\n | MYSQL_ERRNO\n | CONSTRAINT_CATALOG\n | CONSTRAINT_SCHEMA\n | CONSTRAINT_NAME\n | CATALOG_NAME\n | SCHEMA_NAME\n | TABLE_NAME\n | COLUMN_NAME\n | CURSOR_NAME\n\nSIGNAL empties the diagnostics area and produces a custom error. This\nstatement can be used anywhere, but is generally useful when used inside a\nstored program. When the error is produced, it can be caught by a HANDLER. If\nnot, the current stored program, or the current statement, will terminate with\nthe specified error.\n\nSometimes an error HANDLER just needs to SIGNAL the same error it received,\noptionally with some changes. Usually the RESIGNAL statement is the most\nconvenient way to do this.\n\nerror_condition can be an SQLSTATE value or a named error condition defined\nvia DECLARE CONDITION. SQLSTATE must be a constant string consisting of five\ncharacters. These codes are standard to ODBC and ANSI SQL. For customized\nerrors, the recommended SQLSTATE is \'45000\'. For a list of SQLSTATE values\nused by MariaDB, see the MariaDB Error Codes page. The SQLSTATE can be read\nvia the API method mysql_sqlstate( ).\n\nTo specify error properties user-defined variables and local variables can be\nused, as well as character set conversions (but you can\'t set a collation).\n\nThe error properties, their type and their default values are explained in the\ndiagnostics area page.\n\nErrors\n------\n\nIf the SQLSTATE is not valid, the following error like this will be produced:\n\nERROR 1407 (42000): Bad SQLSTATE: \'123456\'\n\nIf a property is specified more than once, an error like this will be produced:\n\nERROR 1641 (42000): Duplicate condition information item \'MESSAGE_TEXT\'\n\nIf you specify a condition name which is not declared, an error like this will\nbe produced:\n\nERROR 1319 (42000): Undefined CONDITION: cond_name\n\nIf MYSQL_ERRNO is out of range, you will get an error like this:\n\nERROR 1231 (42000): Variable \'MYSQL_ERRNO\' can\'t be set to the value of \'0\'\n\nExamples\n--------\n\nHere\'s what happens if SIGNAL is used in the client to generate errors:\n\nSIGNAL SQLSTATE \'01000\';\nQuery OK, 0 rows affected, 1 warning (0.00 sec)\n\nSHOW WARNINGS;\n\n+---------+------+------------------------------------------+\n| Level   | Code | Message                                  |\n+---------+------+------------------------------------------+\n| Warning | 1642 | Unhandled user-defined warning condition |\n+---------+------+------------------------------------------+\n1 row in set (0.06 sec)\n\nSIGNAL SQLSTATE \'02000\';\nERROR 1643 (02000): Unhandled user-defined not found condition\n\nHow to specify MYSQL_ERRNO and MESSAGE_TEXT properties:\n\nSIGNAL SQLSTATE \'45000\' SET MYSQL_ERRNO=30001, MESSAGE_TEXT=\'H\nello, world!\';\n\nERROR 30001 (45000): Hello, world!\n\nThe following code shows how to use user variables, local variables and\ncharacter set conversion with SIGNAL:\n\nCREATE PROCEDURE test_error(x INT)\nBEGIN\n DECLARE errno SMALLINT UNSIGNED DEFAULT 31001;\n SET @errmsg = \'Hello, world!\';\n IF x = 1 THEN\n   SIGNAL SQLSTATE \'45000\' SET\n   MYSQL_ERRNO = errno,\n   MESSAGE_TEXT = @errmsg;\n ELSE\n   SIGNAL SQLSTATE \'45000\' SET\n   MYSQL_ERRNO = errno,\n   MESSAGE_TEXT = _utf8\'Hello, world!\';\n END IF;\nEND;\n\nHow to use named error conditions:\n\nCREATE PROCEDURE test_error(n INT)\nBEGIN\n DECLARE `too_big` CONDITION FOR SQLSTATE \'45000\';\n IF n > 10 THEN\n   SIGNAL `too_big`;\n END IF;\nEND;\n\nIn this example, we\'ll define a HANDLER for an error code. When the error\noccurs, we SIGNAL a more informative error which makes sense for our procedure:\n\nCREATE PROCEDURE test_error()\nBEGIN\n DECLARE EXIT HANDLER\n FOR 1146\n BEGIN\n   SIGNAL SQLSTATE \'45000\' SET\n   MESSAGE_TEXT = \'Temporary tables not found; did you call init()\nprocedure?\';\n END;\n -- this will produce a 1146 error\n SELECT `c` FROM `temptab`;\nEND;\n\nURL: https://mariadb.com/kb/en/signal/','','https://mariadb.com/kb/en/signal/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (307,24,'WHILE','Syntax\n------\n\n[begin_label:] WHILE search_condition DO\n  statement_list\nEND WHILE [end_label]\n\nDescription\n-----------\n\nThe statement list within a WHILE statement is repeated as long as the\nsearch_condition is true. statement_list consists of one or more statements.\nIf the loop must be executed at least once, REPEAT ... LOOP can be used\ninstead.\n\nA WHILE statement can be labeled. end_label cannot be given unless begin_label\nalso is present. If both are present, they must be the same.\n\nExamples\n--------\n\nCREATE PROCEDURE dowhile()\nBEGIN\n DECLARE v1 INT DEFAULT 5;\n\nWHILE v1 > 0 DO\n  ...\n  SET v1 = v1 - 1;\n END WHILE;\nEND\n\nURL: https://mariadb.com/kb/en/while/','','https://mariadb.com/kb/en/while/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (308,24,'Cursor Overview','Description\n-----------\n\nA cursor is a structure that allows you to go over records sequentially, and\nperform processing based on the result.\n\nMariaDB permits cursors inside stored programs, and MariaDB cursors are\nnon-scrollable, read-only and asensitive.\n\n* Non-scrollable means that the rows can only be fetched in the order\nspecified by the SELECT statement. Rows cannot be skipped, you cannot jump to\na specific row, and you cannot fetch rows in reverse order.\n* Read-only means that data cannot be updated through the cursor.\n* Asensitive means that the cursor points to the actual underlying data. This\nkind of cursor is quicker than the alternative, an insensitive cursor, as no\ndata is copied to a temporary table. However, changes to the data being used\nby the cursor will affect the cursor data.\n\nCursors are created with a DECLARE CURSOR statement and opened with an OPEN\nstatement. Rows are read with a FETCH statement before the cursor is finally\nclosed with a CLOSE statement.\n\nWhen FETCH is issued and there are no more rows to extract, the following\nerror is produced:\n\nERROR 1329 (02000): No data - zero rows fetched, selected, or processed\n\nTo avoid problems, a DECLARE HANDLER statement is generally used. The HANDLER\nshould handler the 1329 error, or the \'02000\' SQLSTATE, or the NOT FOUND error\nclass.\n\nOnly SELECT statements are allowed for cursors, and they cannot be contained\nin a variable - so, they cannot be composed dynamically. However, it is\npossible to SELECT from a view. Since the CREATE VIEW statement can be\nexecuted as a prepared statement, it is possible to dynamically create the\nview that is queried by the cursor.\n\nFrom MariaDB 10.3.0, cursors can have parameters. Cursor parameters can appear\nin any part of the DECLARE CURSOR select_statement where a stored procedure\nvariable is allowed (select list, WHERE, HAVING, LIMIT etc). See DECLARE\nCURSOR and OPEN for syntax, and below for an example:\n\nExamples\n--------\n\nCREATE TABLE c1(i INT);\n\nCREATE TABLE c2(i INT);\n\nCREATE TABLE c3(i INT);\n\nDELIMITER //\n\nCREATE PROCEDURE p1()\nBEGIN\n DECLARE done INT DEFAULT FALSE;\n DECLARE x, y INT;\n DECLARE cur1 CURSOR FOR SELECT i FROM test.c1;\n DECLARE cur2 CURSOR FOR SELECT i FROM test.c2;\n DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\n\nOPEN cur1;\n OPEN cur2;\n\nread_loop: LOOP\n  FETCH cur1 INTO x;\n  FETCH cur2 INTO y;\n  IF done THEN\n   LEAVE read_loop;\n  END IF;\n  IF x < y THEN\n   INSERT INTO test.c3 VALUES (x);\n  ELSE\n   INSERT INTO test.c3 VALUES (y);\n  END IF;\n END LOOP;\n\nCLOSE cur1;\n CLOSE cur2;\nEND; //\n\nDELIMITER ;\n\nINSERT INTO c1 VALUES(5),(50),(500);\n\nINSERT INTO c2 VALUES(10),(20),(30);\n\nCALL p1;\n\nSELECT * FROM c3;\n+------+\n| i    |\n+------+\n|    5 |\n|   20 |\n|   30 |\n+------+\n\nFrom MariaDB 10.3.0\n\nDROP PROCEDURE IF EXISTS p1;\nDROP TABLE IF EXISTS t1;\nCREATE TABLE t1 (a INT, b VARCHAR(10));\n\nINSERT INTO t1 VALUES (1,\'old\'),(2,\'old\'),(3,\'old\'),(4,\'old\'),(5,\'old\');\n\nDELIMITER //\n\nCREATE PROCEDURE p1(min INT,max INT)\nBEGIN\n DECLARE done INT DEFAULT FALSE;\n DECLARE va INT;\n DECLARE cur CURSOR(pmin INT, pmax INT) FOR SELECT a FROM t1 WHERE a BETWEEN\npmin AND pmax;\n DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;\n OPEN cur(min,max);\n read_loop: LOOP\n  FETCH cur INTO va;\n  IF done THEN\n   LEAVE read_loop;\n  END IF;\n  INSERT INTO t1 VALUES (va,\'new\');\n END LOOP;\n CLOSE cur;\nEND;\n//\n\nDELIMITER ;\n\nCALL p1(2,4);\n\nSELECT * FROM t1;\n+------+------+\n| a    | b    |\n+------+------+\n|    1 | old  |\n|    2 | old  |\n|    3 | old  |\n|    4 | old  |\n|    5 | old  |\n|    2 | new  |\n|    3 | new  |\n|    4 | new  |\n+------+------+\n\nURL: https://mariadb.com/kb/en/cursor-overview/','','https://mariadb.com/kb/en/cursor-overview/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (309,24,'DECLARE CURSOR','Syntax\n------\n\n<= MariaDB 10.2\n\nDECLARE cursor_name CURSOR FOR select_statement\n\nFrom MariaDB 10.3\n\nDECLARE cursor_name CURSOR [(cursor_formal_parameter[,...])] FOR\nselect_statement\n\ncursor_formal_parameter:\n  name type [collate clause]\n\nFrom MariaDB 10.8\n\nDECLARE cursor_name CURSOR [(cursor_formal_parameter[,...])] FOR\nselect_statement\n\ncursor_formal_parameter:\n  [IN] name type [collate clause]\n\nDescription\n-----------\n\nThis statement declares a cursor. Multiple cursors may be declared in a stored\nprogram, but each cursor in a given block must have a unique name.\n\nselect_statement is not executed until the OPEN statement is executed. It is\nimportant to remember this if the query produces an error, or calls functions\nwhich have side effects.\n\nA SELECT associated to a cursor can use variables, but the query itself cannot\nbe a variable, and cannot be dynamically composed. The SELECT statement cannot\nhave an INTO clause.\n\nCursors must be declared before HANDLERs, but after local variables and\nCONDITIONs.\n\nParameters\n----------\n\nMariaDB starting with 10.3.0\n----------------------------\nFrom MariaDB 10.3.0, cursors can have parameters. This is a non-standard SQL\nextension. Cursor parameters can appear in any part of the DECLARE CURSOR\nselect_statement where a stored procedure variable is allowed (select list,\nWHERE, HAVING, LIMIT etc).\n\nIN\n--\n\nMariaDB starting with 10.8.0\n----------------------------\nFrom MariaDB 10.8.0 preview release, the IN qualifier is supported in the\ncursor_format_parameter part of the syntax.\n\nSee Cursor Overview for an example.\n\nURL: https://mariadb.com/kb/en/declare-cursor/','','https://mariadb.com/kb/en/declare-cursor/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (310,24,'OPEN','Syntax\n------\n\n<= MariaDB 10.2\n\nOPEN cursor_name\n\nFrom MariaDB 10.3\n\nOPEN cursor_name [expression[,...]];\n\nDescription\n-----------\n\nThis statement opens a cursor which was previously declared with DECLARE\nCURSOR.\n\nThe query associated to the DECLARE CURSOR is executed when OPEN is executed.\nIt is important to remember this if the query produces an error, or calls\nfunctions which have side effects.\n\nThis is necessary in order to FETCH rows from a cursor.\n\nSee Cursor Overview for an example.\n\nURL: https://mariadb.com/kb/en/open/','','https://mariadb.com/kb/en/open/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (311,24,'FETCH','Syntax\n------\n\nFETCH cursor_name INTO var_name [, var_name] ...\n\nDescription\n-----------\n\nThis statement fetches the next row (if a row exists) using the specified open\ncursor, and advances the cursor pointer.\n\nvar_name can be a local variable, but not a user-defined variable.\n\nIf no more rows are available, a No Data condition occurs with SQLSTATE value\n02000. To detect this condition, you can set up a handler for it (or for a NOT\nFOUND condition).\n\nSee Cursor Overview for an example.\n\nURL: https://mariadb.com/kb/en/fetch/','','https://mariadb.com/kb/en/fetch/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (312,24,'CLOSE','Syntax\n------\n\nCLOSE cursor_name\n\nDescription\n-----------\n\nThis statement closes a previously opened cursor. The cursor must have been\npreviously opened or else an error occurs.\n\nIf not closed explicitly, a cursor is closed at the end of the compound\nstatement in which it was declared.\n\nSee Cursor Overview for an example.\n\nURL: https://mariadb.com/kb/en/close/','','https://mariadb.com/kb/en/close/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (313,25,'BUFFER','A synonym for ST_BUFFER.\n\nURL: https://mariadb.com/kb/en/buffer/','','https://mariadb.com/kb/en/buffer/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (314,25,'CONVEXHULL','A synonym for ST_CONVEXHULL.\n\nURL: https://mariadb.com/kb/en/convexhull/','','https://mariadb.com/kb/en/convexhull/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (315,25,'GEOMETRYCOLLECTION','Syntax\n------\n\nGeometryCollection(g1,g2,...)\n\nDescription\n-----------\n\nConstructs a WKB GeometryCollection. If any argument is not a well-formed WKB\nrepresentation of a geometry, the return value is NULL.\n\nExamples\n--------\n\nCREATE TABLE gis_geometrycollection  (g GEOMETRYCOLLECTION);\nSHOW FIELDS FROM gis_geometrycollection;\nINSERT INTO gis_geometrycollection VALUES\n  (GeomCollFromText(\'GEOMETRYCOLLECTION(POINT(0 0), LINESTRING(0 0,10\n10))\')),\n  (GeometryFromWKB(AsWKB(GeometryCollection(Point(44, 6),\nLineString(Point(3, 6), Point(7, 9)))))),\n  (GeomFromText(\'GeometryCollection()\')),\n  (GeomFromText(\'GeometryCollection EMPTY\'));\n\nURL: https://mariadb.com/kb/en/geometrycollection/','','https://mariadb.com/kb/en/geometrycollection/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (316,25,'LINESTRING','Syntax\n------\n\nLineString(pt1,pt2,...)\n\nDescription\n-----------\n\nConstructs a WKB LineString value from a number of WKB Point arguments. If any\nargument is not a WKB Point, the return value is NULL. If the number of Point\narguments is less than two, the return value is NULL.\n\nExamples\n--------\n\nSET @ls = \'LineString(1 1,2 2,3 3)\';\n\nSELECT AsText(EndPoint(GeomFromText(@ls)));\n+-------------------------------------+\n| AsText(EndPoint(GeomFromText(@ls))) |\n+-------------------------------------+\n| POINT(3 3)                          |\n+-------------------------------------+\n\nCREATE TABLE gis_line  (g LINESTRING);\nINSERT INTO gis_line VALUES\n  (LineFromText(\'LINESTRING(0 0,0 10,10 0)\')),\n  (LineStringFromText(\'LINESTRING(10 10,20 10,20 20,10 20,10 10)\')),\n  (LineStringFromWKB(AsWKB(LineString(Point(10, 10), Point(40, 10)))));\n\nURL: https://mariadb.com/kb/en/linestring/','','https://mariadb.com/kb/en/linestring/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (317,25,'MULTILINESTRING','Syntax\n------\n\nMultiLineString(ls1,ls2,...)\n\nDescription\n-----------\n\nConstructs a WKB MultiLineString value using WKB LineString arguments. If any\nargument is not a WKB LineString, the return value is NULL.\n\nExample\n-------\n\nCREATE TABLE gis_multi_line (g MULTILINESTRING);\nINSERT INTO gis_multi_line VALUES\n (MultiLineStringFromText(\'MULTILINESTRING((10 48,10 21,10 0),(16 0,16 23,16\n48))\')),\n (MLineFromText(\'MULTILINESTRING((10 48,10 21,10 0))\')),\n (MLineFromWKB(AsWKB(MultiLineString(LineString(Point(1, 2), \n  Point(3, 5)), LineString(Point(2, 5),Point(5, 8),Point(21, 7))))));\n\nURL: https://mariadb.com/kb/en/multilinestring/','','https://mariadb.com/kb/en/multilinestring/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (318,25,'MULTIPOINT','Syntax\n------\n\nMultiPoint(pt1,pt2,...)\n\nDescription\n-----------\n\nConstructs a WKB MultiPoint value using WKB Point arguments. If any argument\nis not a WKB Point, the return value is NULL.\n\nExamples\n--------\n\nSET @g = ST_GEOMFROMTEXT(\'MultiPoint( 1 1, 2 2, 5 3, 7 2, 9 3, 8 4, 6 6, 6 9,\n4 9, 1 5 )\');\n\nCREATE TABLE gis_multi_point (g MULTIPOINT);\nINSERT INTO gis_multi_point VALUES\n  (MultiPointFromText(\'MULTIPOINT(0 0,10 10,10 20,20 20)\')),\n  (MPointFromText(\'MULTIPOINT(1 1,11 11,11 21,21 21)\')),\n  (MPointFromWKB(AsWKB(MultiPoint(Point(3, 6), Point(4, 10)))));\n\nURL: https://mariadb.com/kb/en/multipoint/','','https://mariadb.com/kb/en/multipoint/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (319,25,'MULTIPOLYGON','Syntax\n------\n\nMultiPolygon(poly1,poly2,...)\n\nDescription\n-----------\n\nConstructs a WKB MultiPolygon value from a set of WKB Polygon arguments. If\nany argument is not a WKB Polygon, the return value is NULL.\n\nExample\n-------\n\nCREATE TABLE gis_multi_polygon  (g MULTIPOLYGON);\nINSERT INTO gis_multi_polygon VALUES\n  (MultiPolygonFromText(\'MULTIPOLYGON(((28 26,28 0,84 0,84 42,28 26),(52\n18,66 23,73 9,48 6,52 18)),\n  ((59 18,67 18,67 13,59 13,59 18)))\')),\n  (MPolyFromText(\'MULTIPOLYGON(((28 26,28 0,84 0,84 42,28 26),(52 18,66\n23,73 9,48 6,52 18)),\n    ((59 18,67 18,67 13,59 13,59 18)))\')),\n  (MPolyFromWKB(AsWKB(MultiPolygon(Polygon(LineString(\n   Point(0, 3), Point(3, 3), Point(3, 0), Point(0, 3)))))));\n\nURL: https://mariadb.com/kb/en/multipolygon/','','https://mariadb.com/kb/en/multipolygon/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (320,25,'POINT','Syntax\n------\n\nPoint(x,y)\n\nDescription\n-----------\n\nConstructs a WKB Point using the given coordinates.\n\nExamples\n--------\n\nSET @g = ST_GEOMFROMTEXT(\'Point(1 1)\');\n\nCREATE TABLE gis_point  (g POINT);\nINSERT INTO gis_point VALUES\n  (PointFromText(\'POINT(10 10)\')),\n  (PointFromText(\'POINT(20 10)\')),\n  (PointFromText(\'POINT(20 20)\')),\n  (PointFromWKB(AsWKB(PointFromText(\'POINT(10 20)\'))));\n\nURL: https://mariadb.com/kb/en/point/','','https://mariadb.com/kb/en/point/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (321,25,'PointOnSurface','A synonym for ST_PointOnSurface.\n\nURL: https://mariadb.com/kb/en/pointonsurface/','','https://mariadb.com/kb/en/pointonsurface/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (322,25,'POLYGON','Syntax\n------\n\nPolygon(ls1,ls2,...)\n\nDescription\n-----------\n\nConstructs a WKB Polygon value from a number of WKB LineString arguments. If\nany argument does not represent the WKB of a LinearRing (that is, not a closed\nand simple LineString) the return value is NULL.\n\nNote that according to the OpenGIS standard, a POLYGON should have exactly one\nExteriorRing and all other rings should lie within that ExteriorRing and thus\nbe the InteriorRings. Practically, however, some systems, including MariaDB\'s,\npermit polygons to have several \'ExteriorRings\'. In the case of there being\nmultiple, non-overlapping exterior rings ST_NUMINTERIORRINGS() will return 1.\n\nExamples\n--------\n\nSET @g = ST_GEOMFROMTEXT(\'POLYGON((1 1,1 5,4 9,6 9,9 3,7 2,1 1))\');\n\nCREATE TABLE gis_polygon   (g POLYGON);\nINSERT INTO gis_polygon VALUES\n  (PolygonFromText(\'POLYGON((10 10,20 10,20 20,10 20,10 10))\')),\n  (PolyFromText(\'POLYGON((0 0,50 0,50 50,0 50,0 0), (10 10,20 10,20 20,10\n20,10 10))\')),\n  (PolyFromWKB(AsWKB(Polygon(LineString(Point(0, 0), Point(30, 0), Point(30,\n30), Point(0, 0))))));\n\nNon-overlapping \'polygon\':\n\nSELECT ST_NumInteriorRings(ST_PolyFromText(\'POLYGON((0 0,10 0,10 10,0 10,0 0),\n (-1 -1,-5 -1,-5 -5,-1 -5,-1 -1))\')) AS NumInteriorRings;\n+------------------+\n| NumInteriorRings |\n+------------------+\n|                1 |\n+------------------+\n\nURL: https://mariadb.com/kb/en/polygon/','','https://mariadb.com/kb/en/polygon/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (323,25,'ST_BUFFER','Syntax\n------\n\nST_BUFFER(g1,r)\nBUFFER(g1,r)\n\nDescription\n-----------\n\nReturns a geometry that represents all points whose distance from geometry g1\nis less than or equal to distance, or radius, r.\n\nUses for this function could include creating for example a new geometry\nrepresenting a buffer zone around an island.\n\nBUFFER() is a synonym.\n\nExamples\n--------\n\nDetermining whether a point is within a buffer zone:\n\nSET @g1 = ST_GEOMFROMTEXT(\'POLYGON((10 10, 10 20, 20 20, 20 10, 10 10))\');\n\nSET @g2 = ST_GEOMFROMTEXT(\'POINT(8 8)\');\n\nSELECT ST_WITHIN(@g2,ST_BUFFER(@g1,5));\n+---------------------------------+\n| ST_WITHIN(@g2,ST_BUFFER(@g1,5)) |\n+---------------------------------+\n|                               1 |\n+---------------------------------+\n\nSELECT ST_WITHIN(@g2,ST_BUFFER(@g1,1));\n+---------------------------------+\n| ST_WITHIN(@g2,ST_BUFFER(@g1,1)) |\n+---------------------------------+\n|                               0 |\n+---------------------------------+\n\nURL: https://mariadb.com/kb/en/st_buffer/','','https://mariadb.com/kb/en/st_buffer/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (324,25,'ST_CONVEXHULL','MariaDB starting with 10.1.2\n----------------------------\nST_ConvexHull() was introduced in MariaDB 10.1.2\n\nSyntax\n------\n\nST_ConvexHull(g)\nConvexHull(g)\n\nDescription\n-----------\n\nGiven a geometry, returns a geometry that is the minimum convex geometry\nenclosing all geometries within the set. Returns NULL if the geometry value is\nNULL or an empty value.\n\nST_ConvexHull() and ConvexHull() are synonyms.\n\nExamples\n--------\n\nThe ConvexHull of a single point is simply the single point:\n\nSET @g = ST_GEOMFROMTEXT(\'Point(0 0)\');\n\nSELECT ST_ASTEXT(ST_CONVEXHULL(@g));\n+------------------------------+\n| ST_ASTEXT(ST_CONVEXHULL(@g)) |\n+------------------------------+\n| POINT(0 0)                   |\n+------------------------------+\n\nSET @g = ST_GEOMFROMTEXT(\'MultiPoint(0 0, 1 2, 2 3)\');\n\nSELECT ST_ASTEXT(ST_CONVEXHULL(@g));\n+------------------------------+\n| ST_ASTEXT(ST_CONVEXHULL(@g)) |\n+------------------------------+\n| POLYGON((0 0,1 2,2 3,0 0))   |\n+------------------------------+\n\nSET @g = ST_GEOMFROMTEXT(\'MultiPoint( 1 1, 2 2, 5 3, 7 2, 9 3, 8 4, 6 6, 6 9,\n4 9, 1 5 )\');\n\nSELECT ST_ASTEXT(ST_CONVEXHULL(@g));\n+----------------------------------------+\n| ST_ASTEXT(ST_CONVEXHULL(@g))           |\n+----------------------------------------+\n| POLYGON((1 1,1 5,4 9,6 9,9 3,7 2,1 1)) |\n+----------------------------------------+\n\nURL: https://mariadb.com/kb/en/st_convexhull/','','https://mariadb.com/kb/en/st_convexhull/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (325,25,'ST_INTERSECTION','Syntax\n------\n\nST_INTERSECTION(g1,g2)\n\nDescription\n-----------\n\nReturns a geometry that is the intersection, or shared portion, of geometry g1\nand geometry g2.\n\nExamples\n--------\n\nSET @g1 = ST_GEOMFROMTEXT(\'POINT(2 1)\');\n\nSET @g2 = ST_GEOMFROMTEXT(\'LINESTRING(2 1, 0 2)\');\n\nSELECT ASTEXT(ST_INTERSECTION(@g1,@g2));\n+----------------------------------+\n| ASTEXT(ST_INTERSECTION(@g1,@g2)) |\n+----------------------------------+\n| POINT(2 1)                       |\n+----------------------------------+\n\nURL: https://mariadb.com/kb/en/st_intersection/','','https://mariadb.com/kb/en/st_intersection/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (326,25,'ST_POINTONSURFACE','MariaDB starting with 10.1.2\n----------------------------\nST_POINTONSURFACE() was introduced in MariaDB 10.1.2\n\nSyntax\n------\n\nST_PointOnSurface(g)\nPointOnSurface(g)\n\nDescription\n-----------\n\nGiven a geometry, returns a POINT guaranteed to intersect a surface. However,\nsee MDEV-7514.\n\nST_PointOnSurface() and PointOnSurface() are synonyms.\n\nURL: https://mariadb.com/kb/en/st_pointonsurface/','','https://mariadb.com/kb/en/st_pointonsurface/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (327,25,'ST_SYMDIFFERENCE','Syntax\n------\n\nST_SYMDIFFERENCE(g1,g2)\n\nDescription\n-----------\n\nReturns a geometry that represents the portions of geometry g1 and geometry g2\nthat don\'t intersect.\n\nExamples\n--------\n\nSET @g1 = ST_GEOMFROMTEXT(\'LINESTRING(10 20, 10 40)\');\n\nSET @g2 = ST_GEOMFROMTEXT(\'LINESTRING(10 15, 10 25)\');\n\nSELECT ASTEXT(ST_SYMDIFFERENCE(@g1,@g2));\n+----------------------------------------------+\n| ASTEXT(ST_SYMDIFFERENCE(@g1,@g2))            |\n+----------------------------------------------+\n| MULTILINESTRING((10 15,10 20),(10 25,10 40)) |\n+----------------------------------------------+\n\nSET @g2 = ST_GeomFromText(\'LINESTRING(10 20, 10 41)\');\n\nSELECT ASTEXT(ST_SYMDIFFERENCE(@g1,@g2));\n+-----------------------------------+\n| ASTEXT(ST_SYMDIFFERENCE(@g1,@g2)) |\n+-----------------------------------+\n| LINESTRING(10 40,10 41)           |\n+-----------------------------------+\n\nURL: https://mariadb.com/kb/en/st_symdifference/','','https://mariadb.com/kb/en/st_symdifference/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (328,25,'ST_UNION','Syntax\n------\n\nST_UNION(g1,g2)\n\nDescription\n-----------\n\nReturns a geometry that is the union of the geometry g1 and geometry g2.\n\nExamples\n--------\n\nSET @g1 = GEOMFROMTEXT(\'POINT (0 2)\');\n\nSET @g2 = GEOMFROMTEXT(\'POINT (2 0)\');\n\nSELECT ASTEXT(ST_UNION(@g1,@g2));\n+---------------------------+\n| ASTEXT(ST_UNION(@g1,@g2)) |\n+---------------------------+\n| MULTIPOINT(2 0,0 2)       |\n+---------------------------+\n\nSET @g1 = GEOMFROMTEXT(\'POLYGON((0 0,0 3,3 3,3 0,0 0))\');\n\nSET @g2 = GEOMFROMTEXT(\'POLYGON((2 2,4 2,4 4,2 4,2 2))\');\n\nSELECT ASTEXT(ST_UNION(@g1,@g2));\n+------------------------------------------------+\n| ASTEXT(ST_UNION(@g1,@g2))                      |\n+------------------------------------------------+\n| POLYGON((0 0,0 3,2 3,2 4,4 4,4 2,3 2,3 0,0 0)) |\n+------------------------------------------------+\n\nURL: https://mariadb.com/kb/en/st_union/','','https://mariadb.com/kb/en/st_union/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (329,26,'SHOW GRANTS','Syntax\n------\n\nSHOW GRANTS [FOR user|role]\n\nDescription\n-----------\n\nThe SHOW GRANTS statement lists privileges granted to a particular user or\nrole.\n\nUsers\n-----\n\nThe statement lists the GRANT statement or statements that must be issued to\nduplicate the privileges that are granted to a MariaDB user account. The\naccount is named using the same format as for the GRANT statement; for\nexample, \'jeffrey\'@\'localhost\'. If you specify only the user name part of the\naccount name, a host name part of \'%\' is used. For additional information\nabout specifying account names, see GRANT.\n\nSHOW GRANTS FOR \'root\'@\'localhost\';\n+---------------------------------------------------------------------+\n| Grants for root@localhost                                           |\n+---------------------------------------------------------------------+\n| GRANT ALL PRIVILEGES ON *.* TO \'root\'@\'localhost\' WITH GRANT OPTION |\n+---------------------------------------------------------------------+\n\nTo list the privileges granted to the account that you are using to connect to\nthe server, you can use any of the following statements:\n\nSHOW GRANTS;\nSHOW GRANTS FOR CURRENT_USER;\nSHOW GRANTS FOR CURRENT_USER();\n\nIf SHOW GRANTS FOR CURRENT_USER (or any of the equivalent syntaxes) is used in\nDEFINER context (such as within a stored procedure that is defined with SQL\nSECURITY DEFINER), the grants displayed are those of the definer and not the\ninvoker.\n\nNote that the DELETE HISTORY privilege, introduced in MariaDB 10.3.4, was\ndisplayed as DELETE VERSIONING ROWS when running SHOW GRANTS until MariaDB\n10.3.15 (MDEV-17655).\n\nRoles\n-----\n\nSHOW GRANTS can also be used to view the privileges granted to a role.\n\nExample\n-------\n\nSHOW GRANTS FOR journalist;\n+------------------------------------------+\n| Grants for journalist                    |\n+------------------------------------------+\n| GRANT USAGE ON *.* TO \'journalist\'       |\n| GRANT DELETE ON `test`.* TO \'journalist\' |\n+------------------------------------------+\n\nFOR PUBLIC\n----------\n\nMariaDB starting with 10.11\n---------------------------\nGRANT ... TO PUBLIC was introduced in MariaDB 10.11 to grant privileges to all\nusers. SHOW GRANTS FOR PUBLIC shows all these grants.\n\nSHOW GRANTS FOR public;\n+------------------------------------------------+\n| Grants for PUBLIC                              |\n+------------------------------------------------+\n| GRANT ALL PRIVILEGES ON `dev_db`.* TO `PUBLIC` |\n+------------------------------------------------+\n\nURL: https://mariadb.com/kb/en/show-grants/','','https://mariadb.com/kb/en/show-grants/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (330,26,'SHOW CREATE USER','Syntax\n------\n\nSHOW CREATE USER user_name\n\nDescription\n-----------\n\nShows the CREATE USER statement that created the given user. The statement\nrequires the SELECT privilege for the mysql database, except for the current\nuser.\n\nExamples\n--------\n\nCREATE USER foo4@test require cipher \'text\' \n issuer \'foo_issuer\' subject \'foo_subject\';\n\nSHOW CREATE USER foo4@test\\G\n*************************** 1. row ***************************\nCREATE USER \'foo4\'@\'test\' \n REQUIRE ISSUER \'foo_issuer\'\n SUBJECT \'foo_subject\'\n CIPHER \'text\'\n\nUser Password Expiry:\n\nCREATE USER \'monty\'@\'localhost\' PASSWORD EXPIRE INTERVAL 120 DAY;\n\nSHOW CREATE USER \'monty\'@\'localhost\';\n+------------------------------------------------------------------+\n| CREATE USER for monty@localhost                                  |\n+------------------------------------------------------------------+\n| CREATE USER \'monty\'@\'localhost\' PASSWORD EXPIRE INTERVAL 120 DAY |\n+------------------------------------------------------------------+\n\nURL: https://mariadb.com/kb/en/show-create-user/','','https://mariadb.com/kb/en/show-create-user/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (331,26,'SHOW COLUMNS','Syntax\n------\n\nSHOW [FULL] {COLUMNS | FIELDS} FROM tbl_name [FROM db_name]\n  [LIKE \'pattern\' | WHERE expr]\n\nDescription\n-----------\n\nSHOW COLUMNS displays information about the columns in a given table. It also\nworks for views. The LIKE clause, if present on its own, indicates which\ncolumn names to match. The WHERE and LIKE clauses can be given to select rows\nusing more general conditions, as discussed in Extended SHOW.\n\nIf the data types differ from what you expect them to be based on a CREATE\nTABLE statement, note that MariaDB sometimes changes data types when you\ncreate or alter a table. The conditions under which this occurs are described\nin the Silent Column Changes article.\n\nThe FULL keyword causes the output to include the column collation and\ncomments, as well as the privileges you have for each column.\n\nYou can use db_name.tbl_name as an alternative to the tbl_name FROM db_name\nsyntax. In other words, these two statements are equivalent:\n\nSHOW COLUMNS FROM mytable FROM mydb;\nSHOW COLUMNS FROM mydb.mytable;\n\nSHOW COLUMNS displays the following values for each table column:\n\nField indicates the column name.\n\nType indicates the column data type.\n\nCollation indicates the collation for non-binary string columns, or NULL for\nother columns. This value is displayed only if you use the FULL keyword.\n\nThe Null field contains YES if NULL values can be stored in the column, NO if\nnot.\n\nThe Key field indicates whether the column is indexed:\n\n* If Key is empty, the column either is not indexed or is indexed only as a\n secondary column in a multiple-column, non-unique index.\n* If Key is PRI, the column is a PRIMARY KEY or\n is one of the columns in a multiple-column PRIMARY KEY.\n* If Key is UNI, the column is the first column of a unique-valued\n index that cannot contain NULL values.\n* If Key is MUL, multiple occurrences of a given value are allowed\n within the column. The column is the first column of a non-unique index or a\n unique-valued index that can contain NULL values.\n\nIf more than one of the Key values applies to a given column of a table, Key\ndisplays the one with the highest priority, in the order PRI, UNI, MUL.\n\nA UNIQUE index may be displayed as PRI if it cannot contain NULL values and\nthere is no PRIMARY KEY in the table. A UNIQUE index may display as MUL if\nseveral columns form a composite UNIQUE index; although the combination of the\ncolumns is unique, each column can still hold multiple occurrences of a given\nvalue.\n\nThe Default field indicates the default value that is assigned to the column.\n\nThe Extra field contains any additional information that is available about a\ngiven column.\n\n+------------------------+---------------------------------------------------+\n| Value                  | Description                                       |\n+------------------------+---------------------------------------------------+\n| AUTO_INCREMENT         | The column was created with the AUTO_INCREMENT    |\n|                        | keyword.                                          |\n+------------------------+---------------------------------------------------+\n| PERSISTENT             | The column was created with the PERSISTENT        |\n|                        | keyword. (New in 5.3)                             |\n+------------------------+---------------------------------------------------+\n| VIRTUAL                | The column was created with the VIRTUAL keyword.  |\n|                        | (New in 5.3)                                      |\n+------------------------+---------------------------------------------------+\n| on update              | The column is a TIMESTAMP column that is          |\n| CURRENT_TIMESTAMP      | automatically updated on INSERT and UPDATE.       |\n+------------------------+---------------------------------------------------+\n\nPrivileges indicates the privileges you have for the column. This value is\ndisplayed only if you use the FULL keyword.\n\nComment indicates any comment the column has. This value is displayed only if\nyou use the FULL keyword.\n\nSHOW FIELDS is a synonym for SHOW COLUMNS. Also DESCRIBE and EXPLAIN can be\nused as shortcuts.\n\nYou can also list a table\'s columns with:\n\nmysqlshow db_name tbl_name\n\nSee the mysqlshow command for more details.\n\nThe DESCRIBE statement provides information similar to SHOW COLUMNS. The\ninformation_schema.COLUMNS table provides similar, but more complete,\ninformation.\n\nThe SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also\nprovide information about tables.\n\nExamples\n--------\n\nSHOW COLUMNS FROM city;\n+------------+----------+------+-----+---------+----------------+\n| Field      | Type     | Null | Key | Default | Extra          |\n+------------+----------+------+-----+---------+----------------+\n| Id         | int(11)  | NO   | PRI | NULL    | auto_increment |\n| Name       | char(35) | NO   |     |         |                |\n| Country    | char(3)  | NO   | UNI |         |                |\n| District   | char(20) | YES  | MUL |         |                |\n| Population | int(11)  | NO   |     | 0       |                |\n+------------+----------+------+-----+---------+----------------+\n\nSHOW COLUMNS FROM employees WHERE Type LIKE \'Varchar%\';\n+---------------+-------------+------+-----+---------+-------+\n| Field         | Type        | Null | Key | Default | Extra |\n+---------------+-------------+------+-----+---------+-------+','','https://mariadb.com/kb/en/show-columns/');
update help_topic set description = CONCAT(description, '\n| first_name    | varchar(30) | NO   | MUL | NULL    |       |\n| last_name     | varchar(40) | NO   |     | NULL    |       |\n| position      | varchar(25) | NO   |     | NULL    |       |\n| home_address  | varchar(50) | NO   |     | NULL    |       |\n| home_phone    | varchar(12) | NO   |     | NULL    |       |\n| employee_code | varchar(25) | NO   | UNI | NULL    |       |\n+---------------+-------------+------+-----+---------+-------+\n\nURL: https://mariadb.com/kb/en/show-columns/') WHERE help_topic_id = 331;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (332,26,'SHOW CREATE TABLE','Syntax\n------\n\nSHOW CREATE TABLE tbl_name\n\nDescription\n-----------\n\nShows the CREATE TABLE statement that created the given table. The statement\nrequires the SELECT privilege for the table. This statement also works with\nviews and SEQUENCE.\n\nSHOW CREATE TABLE quotes table and column names according to the value of the\nsql_quote_show_create server system variable.\n\nCertain SQL_MODE values can result in parts of the original CREATE statement\nnot being included in the output. MariaDB-specific table options, column\noptions, and index options are not included in the output of this statement if\nthe NO_TABLE_OPTIONS, NO_FIELD_OPTIONS and NO_KEY_OPTIONS SQL_MODE flags are\nused. All MariaDB-specific table attributes are also not shown when a\nnon-MariaDB/MySQL emulation mode is used, which includes ANSI, DB2,\nPOSTGRESQL, MSSQL, MAXDB or ORACLE.\n\nInvalid table options, column options and index options are normally commented\nout (note, that it is possible to create a table with invalid options, by\naltering a table of a different engine, where these options were valid). To\nhave them uncommented, enable the IGNORE_BAD_TABLE_OPTIONS SQL_MODE. Remember\nthat replaying a CREATE TABLE statement with uncommented invalid options will\nfail with an error, unless the IGNORE_BAD_TABLE_OPTIONS SQL_MODE is in effect.\n\nNote that SHOW CREATE TABLE is not meant to provide metadata about a table. It\nprovides information about how the table was declared, but the real table\nstructure could differ a bit. For example, if an index has been declared as\nHASH, the CREATE TABLE statement returned by SHOW CREATE TABLE will declare\nthat index as HASH; however, it is possible that the index is in fact a BTREE,\nbecause the storage engine does not support HASH.\n\nMariaDB starting with 10.2.1\n----------------------------\nMariaDB 10.2.1 permits TEXT and BLOB data types to be assigned a DEFAULT\nvalue. As a result, from MariaDB 10.2.1, SHOW CREATE TABLE will append a\nDEFAULT NULL to nullable TEXT or BLOB fields if no specific default is\nprovided.\n\nMariaDB starting with 10.2.2\n----------------------------\nFrom MariaDB 10.2.2, numbers are no longer quoted in the DEFAULT clause in\nSHOW CREATE statement. Previously, MariaDB quoted numbers.\n\nIndex Order\n-----------\n\nIndexes are sorted and displayed in the following order, which may differ from\nthe order of the CREATE TABLE statement.\n\n* PRIMARY KEY\n* UNIQUE keys where all column are NOT NULL\n* UNIQUE keys that don\'t contain partial segments\n* Other UNIQUE keys\n* LONG UNIQUE keys\n* Normal keys\n* Fulltext keys\n\nSee sql/sql_table.cc for details.\n\nExamples\n--------\n\nSHOW CREATE TABLE t\\G\n*************************** 1. row ***************************\n   Table: t\nCreate Table: CREATE TABLE `t` (\n `id` int(11) NOT NULL AUTO_INCREMENT,\n `s` char(60) DEFAULT NULL,\n PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nWith sql_quote_show_create off:\n\nSHOW CREATE TABLE t\\G\n*************************** 1. row ***************************\n   Table: t\nCreate Table: CREATE TABLE t (\n id int(11) NOT NULL AUTO_INCREMENT,\n s char(60) DEFAULT NULL,\n PRIMARY KEY (id)\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nUnquoted numeric DEFAULTs, from MariaDB 10.2.2:\n\nCREATE TABLE td (link TINYINT DEFAULT 1);\n\nSHOW CREATE TABLE td\\G\n*************************** 1. row ***************************\n   Table: td\nCreate Table: CREATE TABLE `td` (\n `link` tinyint(4) DEFAULT 1\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nQuoted numeric DEFAULTs, until MariaDB 10.2.1:\n\nCREATE TABLE td (link TINYINT DEFAULT 1);\n\nSHOW CREATE TABLE td\\G\n*************************** 1. row ***************************\n   Table: td\nCreate Table: CREATE TABLE `td` (\n `link` tinyint(4) DEFAULT \'1\'\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nSQL_MODE impacting the output:\n\nSELECT @@sql_mode;\n+------------------------------------------------------------------------------\n------------+\n| @@sql_mode                                                                  \n      |\n+------------------------------------------------------------------------------\n------------+\n|\nSTRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SU\nSTITUTION |\n+------------------------------------------------------------------------------\n------------+\n\nCREATE TABLE `t1` (\n   `id` int(11) NOT NULL AUTO_INCREMENT,\n   `msg` varchar(100) DEFAULT NULL,\n   PRIMARY KEY (`id`)\n  ) ENGINE=InnoDB DEFAULT CHARSET=latin1\n;\n\nSHOW CREATE TABLE t1\\G\n*************************** 1. row ***************************\n   Table: t1\nCreate Table: CREATE TABLE `t1` (\n `id` int(11) NOT NULL AUTO_INCREMENT,\n `msg` varchar(100) DEFAULT NULL,\n PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=latin1\n\nSET SQL_MODE=ORACLE;\n\nSHOW CREATE TABLE t1\\G\n*************************** 1. row ***************************\n   Table: t1\nCreate Table: CREATE TABLE \"t1\" (\n \"id\" int(11) NOT NULL,\n \"msg\" varchar(100) DEFAULT NULL,\n PRIMARY KEY (\"id\")\n\nURL: https://mariadb.com/kb/en/show-create-table/','','https://mariadb.com/kb/en/show-create-table/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (333,26,'SHOW INDEX','Syntax\n------\n\nSHOW {INDEX | INDEXES | KEYS} \n FROM tbl_name [FROM db_name]\n [WHERE expr]\n\nDescription\n-----------\n\nSHOW INDEX returns table index information. The format resembles that of the\nSQLStatistics call in ODBC.\n\nYou can use db_name.tbl_name as an alternative to the tbl_name FROM db_name\nsyntax. These two statements are equivalent:\n\nSHOW INDEX FROM mytable FROM mydb;\nSHOW INDEX FROM mydb.mytable;\n\nSHOW KEYS and SHOW INDEXES are synonyms for SHOW INDEX.\n\nYou can also list a table\'s indexes with the mariadb-show/mysqlshow command:\n\nmysqlshow -k db_name tbl_name\n\nThe information_schema.STATISTICS table stores similar information.\n\nThe following fields are returned by SHOW INDEX.\n\n+------------------------+---------------------------------------------------+\n| Field                  | Description                                       |\n+------------------------+---------------------------------------------------+\n| Table                  | Table name                                        |\n+------------------------+---------------------------------------------------+\n| Non_unique             | 1 if the index permits duplicate values, 0 if     |\n|                        | values must be unique.                            |\n+------------------------+---------------------------------------------------+\n| Key_name               | Index name. The primary key is always named       |\n|                        | PRIMARY.                                          |\n+------------------------+---------------------------------------------------+\n| Seq_in_index           | The column\'s sequence in the index, beginning     |\n|                        | with 1.                                           |\n+------------------------+---------------------------------------------------+\n| Column_name            | Column name.                                      |\n+------------------------+---------------------------------------------------+\n| Collation              | Either A, if the column is sorted in ascending    |\n|                        | order in the index, or NULL if it\'s not sorted.   |\n+------------------------+---------------------------------------------------+\n| Cardinality            | Estimated number of unique values in the index.   |\n|                        | The cardinality statistics are calculated at      |\n|                        | various times, and can help the optimizer make    |\n|                        | improved decisions.                               |\n+------------------------+---------------------------------------------------+\n| Sub_part               | NULL if the entire column is included in the      |\n|                        | index, or the number of included characters if    |\n|                        | not.                                              |\n+------------------------+---------------------------------------------------+\n| Packed                 | NULL if the index is not packed, otherwise how    |\n|                        | the index is packed.                              |\n+------------------------+---------------------------------------------------+\n| Null                   | NULL if NULL values are permitted in the column,  |\n|                        | an empty string if NULLs are not permitted.       |\n+------------------------+---------------------------------------------------+\n| Index_type             | The index type, which can be BTREE, FULLTEXT,     |\n|                        | HASH or RTREE. See Storage Engine Index Types.    |\n+------------------------+---------------------------------------------------+\n| Comment                | Other information, such as whether the index is   |\n|                        | disabled.                                         |\n+------------------------+---------------------------------------------------+\n| Index_comment          | Contents of the COMMENT attribute when the index  |\n|                        | was created.                                      |\n+------------------------+---------------------------------------------------+\n| Ignored                | Whether or not an index will be ignored by the    |\n|                        | optimizer. See Ignored Indexes. From MariaDB      |\n|                        | 10.6.0.                                           |\n+------------------------+---------------------------------------------------+\n\nThe WHERE and LIKE clauses can be given to select rows using more general\nconditions, as discussed in Extended SHOW.\n\nExamples\n--------\n\nCREATE TABLE IF NOT EXISTS `employees_example` (\n `id` int(11) NOT NULL AUTO_INCREMENT,\n `first_name` varchar(30) NOT NULL,\n `last_name` varchar(40) NOT NULL,\n `position` varchar(25) NOT NULL,\n `home_address` varchar(50) NOT NULL,\n `home_phone` varchar(12) NOT NULL,\n `employee_code` varchar(25) NOT NULL,\n PRIMARY KEY (`id`),\n UNIQUE KEY `employee_code` (`employee_code`),\n KEY `first_name` (`first_name`,`last_name`)\n) ENGINE=Aria;\n\nINSERT INTO `employees_example` (`first_name`, `last_name`, `position`,\n`home_address`, `home_phone`, `employee_code`)\n VALUES\n (\'Mustapha\', \'Mond\', \'Chief Executive Officer\', \'692 Promiscuous Plaza\',\n\'326-555-3492\', \'MM1\'),\n (\'Henry\', \'Foster\', \'Store Manager\', \'314 Savage Circle\', \'326-555-3847\',\n\'HF1\'),\n (\'Bernard\', \'Marx\', \'Cashier\', \'1240 Ambient Avenue\', \'326-555-8456\', \'BM1\'),\n (\'Lenina\', \'Crowne\', \'Cashier\', \'281 Bumblepuppy Boulevard\', \'328-555-2349\',','','https://mariadb.com/kb/en/show-index/');
update help_topic set description = CONCAT(description, '\n\'LC1\'),\n (\'Fanny\', \'Crowne\', \'Restocker\', \'1023 Bokanovsky Lane\', \'326-555-6329\',\n\'FC1\'),\n (\'Helmholtz\', \'Watson\', \'Janitor\', \'944 Soma Court\', \'329-555-2478\', \'HW1\');\n\nSHOW INDEXES FROM employees_example\\G\n*************************** 1. row ***************************\n    Table: employees_example\n Non_unique: 0\n  Key_name: PRIMARY\n Seq_in_index: 1\n Column_name: id\n  Collation: A\n Cardinality: 6\n  Sub_part: NULL\n   Packed: NULL\n    Null:\n Index_type: BTREE\n   Comment:\nIndex_comment: \n   Ignored: NO\n*************************** 2. row ***************************\n    Table: employees_example\n Non_unique: 0\n  Key_name: employee_code\n Seq_in_index: 1\n Column_name: employee_code\n  Collation: A\n Cardinality: 6\n  Sub_part: NULL\n   Packed: NULL\n    Null:\n Index_type: BTREE\n   Comment:\nIndex_comment: \n   Ignored: NO\n*************************** 3. row ***************************\n    Table: employees_example\n Non_unique: 1\n  Key_name: first_name\n Seq_in_index: 1\n Column_name: first_name\n  Collation: A\n Cardinality: NULL\n  Sub_part: NULL\n   Packed: NULL\n    Null:\n Index_type: BTREE\n   Comment:\nIndex_comment: \n   Ignored: NO\n*************************** 4. row ***************************\n    Table: employees_example\n Non_unique: 1\n  Key_name: first_name\n Seq_in_index: 2\n Column_name: last_name\n  Collation: A\n Cardinality: NULL\n  Sub_part: NULL\n   Packed: NULL\n    Null:\n Index_type: BTREE\n   Comment:\nIndex_comment: \n   Ignored: NO\n\nURL: https://mariadb.com/kb/en/show-index/') WHERE help_topic_id = 333;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (334,26,'SHOW EXPLAIN','Syntax\n------\n\nSHOW EXPLAIN [FORMAT=JSON] FOR <connection_id>;\nEXPLAIN [FORMAT=JSON] FOR CONNECTION <connection_id>;\n\nDescription\n-----------\n\nThe SHOW EXPLAIN command allows one to get an EXPLAIN (that is, a description\nof a query plan) of a query running in a certain connection.\n\nSHOW EXPLAIN FOR <connection_id>;\n\nwill produce an EXPLAIN output for the query that connection number\nconnection_id is running. The connection id can be obtained with SHOW\nPROCESSLIST.\n\nSHOW EXPLAIN FOR 1;\n+------+-------------+-------+-------+---------------+------+---------+------+-\n-------+-------------+\n| id   | select_type | table | type  | possible_keys | key  | key_len | ref  |\nrows    | Extra       |\n+------+-------------+-------+-------+---------------+------+---------+------+-\n-------+-------------+\n|    1 | SIMPLE      | tbl   | index | NULL          | a    | 5       | NULL |\n1000107 | Using index |\n+------+-------------+-------+-------+---------------+------+---------+------+-\n-------+-------------+\n1 row in set, 1 warning (0.00 sec)\n\nThe output is always accompanied with a warning which shows the query the\ntarget connection is running (this shows what the EXPLAIN is for):\n\nSHOW WARNINGS;\n+-------+------+------------------------+\n| Level | Code | Message                |\n+-------+------+------------------------+\n| Note  | 1003 | select sum(a) from tbl |\n+-------+------+------------------------+\n1 row in set (0.00 sec)\n\nEXPLAIN FOR CONNECTION\n----------------------\n\nMariaDB starting with 10.9\n--------------------------\nThe EXPLAIN FOR CONNECTION syntax was added for MySQL compatibility.\n\nFORMAT=JSON\n-----------\n\nMariaDB starting with 10.9\n--------------------------\nSHOW EXPLAIN [FORMAT=JSON] FOR <connection_id> extends SHOW EXPLAIN to return\nmore detailed JSON output.\n\nPossible Errors\n---------------\n\nThe output can be only produced if the target connection is currently running\na query, which has a ready query plan. If this is not the case, the output\nwill be:\n\nSHOW EXPLAIN FOR 2;\nERROR 1932 (HY000): Target is not running an EXPLAINable command\n\nYou will get this error when:\n\n* the target connection is not running a command for which one can run EXPLAIN\n* the target connection is running a command for which one can run EXPLAIN, but\nthere is no query plan yet (for example, tables are open and locks are\n acquired before the query plan is produced)\n\nDifferences Between SHOW EXPLAIN and EXPLAIN Outputs\n----------------------------------------------------\n\nBackground\n----------\n\nIn MySQL, EXPLAIN execution takes a slightly different route from the way the\nreal query (typically the SELECT) is optimized. This is unfortunate, and has\ncaused a number of bugs in EXPLAIN. (For example, see MDEV-326, MDEV-410, and\nlp:1013343. lp:992942 is not directly about EXPLAIN, but it also would not\nhave existed if MySQL didn\'t try to delete parts of a query plan in the middle\nof the query)\n\nSHOW EXPLAIN examines a running SELECT, and hence its output may be slightly\ndifferent from what EXPLAIN SELECT would produce. We did our best to make sure\nthat either the difference is negligible, or SHOW EXPLAIN\'s output is closer\nto reality than EXPLAIN\'s output.\n\nList of Recorded Differences\n----------------------------\n\n* SHOW EXPLAIN may have Extra=\'no matching row in const table\', where  EXPLAIN\nwould produce Extra=\'Impossible WHERE ...\'\n* For queries with subqueries, SHOW EXPLAIN may print select_type==PRIMARY\nwhere regular EXPLAIN used to print select_type==SIMPLE, or vice versa.\n\nRequired Permissions\n--------------------\n\nRunning SHOW EXPLAIN requires the same permissions as running SHOW PROCESSLIST\nwould.\n\nURL: https://mariadb.com/kb/en/show-explain/','','https://mariadb.com/kb/en/show-explain/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (335,26,'BACKUP STAGE','MariaDB starting with 10.4.1\n----------------------------\nThe BACKUP STAGE commands were introduced in MariaDB 10.4.1.\n\nThe BACKUP STAGE commands are a set of commands to make it possible to make an\nefficient external backup tool.\n\nSyntax\n------\n\nBACKUP STAGE [START | FLUSH | BLOCK_DDL | BLOCK_COMMIT | END ]\n\nIn the following text, a transactional table means InnoDB or \"InnoDB-like\nengine with redo log that can lock redo purges and can be copied without locks\nby an outside process\".\n\nGoals with BACKUP STAGE Commands\n--------------------------------\n\n* To be able to do a majority of the backup with the minimum possible server\nlocks. Especially for transactional tables (InnoDB, MyRocks etc) there is only\nneed for a very short block of new commits while copying statistics and log\ntables.\n* DDL are only needed to be blocked for a very short duration of the backup\nwhile mariabackup is copying the tables affected by DDL during the initial\npart of the backup.\n* Most non transactional tables (those that are not in use) will be copied\nduring BACKUP STAGE START.  The exceptions are system statistic and log tables\nthat are not blocked during the backup until BLOCK_COMMIT.\n* Should work efficiently with backup tools that use disk snapshots.\n* Should work as efficiently as possible for all table types that store data\non the local disks.\n* As little copying as possible under higher level stages/locks. For example,\n.frm (dictionary) and .trn (trigger) files should be copying while copying the\ntable data.\n\nBACKUP STAGE Commands\n---------------------\n\nBACKUP STAGE START\n------------------\n\nThe START stage is designed for the following tasks:\n\n* Blocks purge of redo files for storage engines that needs this (Aria)\n* Start logging of DDL commands into \'datadir\'/ddl.log. This may take a short\ntime as the command has to wait until there are no active DDL commands.\n\nBACKUP STAGE FLUSH\n------------------\n\nThe FLUSH stage is designed for the following tasks:\n\n* FLUSH all changes for inactive non-transactional tables, except for\nstatistics and log tables.\n* Close all tables that are not in use, to ensure they are marked as closed\nfor the backup.\n* BLOCK all new write locks for all non transactional tables (except\nstatistics and log tables).  The command will not wait for tables that are in\nuse by read-only transactions.\n\nDDLs don\'t have to be blocked at this stage as they can\'t cause the table to\nbe in an inconsistent state. This is true also for non-transactional tables.\n\nBACKUP STAGE BLOCK_DDL\n----------------------\n\nThe BLOCK_DDL stage is designed for the following tasks:\n\n* Wait for all statements using write locked non-transactional tables to end.\n* Blocks CREATE TABLE, DROP TABLE, TRUNCATE TABLE, and RENAME TABLE.\n* Blocks also start off a new ALTER TABLE and the final rename phase of ALTER\nTABLE. Running ALTER TABLES are not blocked.\n\nBACKUP STAGE BLOCK_COMMIT\n-------------------------\n\nThe BLOCK_COMMIT stage is designed for the following tasks:\n\n* Lock the binary log and commit/rollback to ensure that no changes are\ncommitted to any tables. If there are active commits or data to be copied to\nthe binary log this will be allowed to finish.  Active transactions will not\naffect BLOCK_COMMIT.\n* This doesn\'t lock temporary tables that are not used by replication. However\nthese will be blocked when it\'s time to write to the binary log.\n* Lock system log tables and statistics tables, flush them and mark them\nclosed.\n\nWhen the BLOCK_COMMIT\'s stages return, this is the \'backup time\'. Everything\ncommitted will be in the backup and everything not committed will roll back.\n\nTransactional engines will continue to do changes to the redo log during the\nBLOCK COMMIT stage, but this is not important as all of these will roll back\nlater as the changes will not be committed.\n\nBACKUP STAGE END\n----------------\n\nThe END stage is designed for the following tasks:\n\n* End DDL logging\n* Free resources\n\nUsing BACKUP STAGE Commands with Backup Tools\n---------------------------------------------\n\nUsing BACKUP STAGE Commands with Mariabackup\n--------------------------------------------\n\nThe BACKUP STAGE commands are a set of commands to make it possible to make an\nefficient external backup tool. How Mariabackup uses these commands depends on\nwhether you are using the version that is bundled with MariaDB Community\nServer or the version that is bundled with MariaDB Enterprise Server. See\nMariabackup and BACKUP STAGE Commands for some examples on how Mariabackup\nuses these commands.\n\nIf you would like to use a version of Mariabackup that uses the BACKUP STAGE\ncommands in an efficient way, then one option is to use MariaDB Enterprise\nBackup that is bundled with MariaDB Enterprise Server.\n\nUsing BACKUP STAGE Commands with Storage Snapshots\n--------------------------------------------------\n\nThe BACKUP STAGE commands are a set of commands to make it possible to make an\nefficient external backup tool. These commands could even be used by tools\nthat perform backups by taking a snapshot of a file system, SAN, or some other\nkind of storage device. See Storage Snapshots and BACKUP STAGE Commands for\nsome examples on how to use each BACKUP STAGE command in an efficient way.\n\nPrivileges\n----------\n\nBACKUP STAGE requires the RELOAD privilege.\n\nNotes\n-----\n\n* Only one connection can run BACKUP STAGE START. If a second connection\ntries, it will wait until the first one has executed BACKUP STAGE END.','','https://mariadb.com/kb/en/backup-stage/');
update help_topic set description = CONCAT(description, '\n* If the user skips a BACKUP STAGE, then all intermediate backup stages will\nautomatically be run. This will allow us to add new stages within the BACKUP\nSTAGE hierarchy in the future with even more precise locks without causing\nproblems for tools using an earlier version of the BACKUP STAGE implementation.\n* One can use the max_statement_time or lock_wait_timeout system variables to\nensure that a BACKUP STAGE command doesn\'t block the server too long.\n* DDL logging will only be available in MariaDB Enterprise Server 10.2 and\nlater.\n* A disconnect will automatically release backup stages.\n* There is no easy way to see which is the current stage.\n\nURL: https://mariadb.com/kb/en/backup-stage/') WHERE help_topic_id = 335;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (336,26,'BACKUP LOCK','MariaDB starting with 10.4.2\n----------------------------\nThe BACKUP LOCK command was introduced in MariaDB 10.4.2.\n\nBACKUP LOCK blocks a table from DDL statements. This is mainly intended to be\nused by tools like mariabackup that need to ensure there are no DDLs on a\ntable while the table files are opened. For example, for an Aria table that\nstores data in 3 files with extensions .frm, .MAI and .MAD. Normal read/write\noperations can continue as normal.\n\nSyntax\n------\n\nTo lock a table:\n\nBACKUP LOCK table_name\n\nTo unlock a table:\n\nBACKUP UNLOCK\n\nUsage in a Backup Tool\n----------------------\n\nBACKUP LOCK [database.]table_name;\n - Open all files related to a table (for example, t.frm, t.MAI and t.MYD)\nBACKUP UNLOCK;\n- Copy data\n- Close files\n\nThis ensures that all files are from the same generation, that is created at\nthe same time by the MariaDB server. This works, because the open files will\npoint to the original table files which will not be affected if there is any\nALTER TABLE while copying the files.\n\nPrivileges\n----------\n\nBACKUP LOCK requires the RELOAD privilege.\n\nNotes\n-----\n\n* The idea is that the BACKUP LOCK should be held for as short a time as\npossible by the backup tool. The time to take an uncontested lock is very\nshort! One can easily do 50,000 locks/unlocks per second on low end hardware.\n* One should use different connections for BACKUP STAGE commands and BACKUP\nLOCK.\n\nImplementation\n--------------\n\n* Internally, BACKUP LOCK is implemented by taking an MDLSHARED_HIGH_PRIO MDL\nlock on the table object, which protects the table from any DDL operations.\n\nURL: https://mariadb.com/kb/en/backup-lock/','','https://mariadb.com/kb/en/backup-lock/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (337,26,'FLUSH','Syntax\n------\n\nFLUSH [NO_WRITE_TO_BINLOG | LOCAL]\n  flush_option [, flush_option] ...\n\nor when flushing tables:\n\nFLUSH [NO_WRITE_TO_BINLOG | LOCAL] TABLES [table_list]  [table_flush_option]\n\nwhere table_list is a list of tables separated by , (comma).\n\nDescription\n-----------\n\nThe FLUSH statement clears or reloads various internal caches used by MariaDB.\nTo execute FLUSH, you must have the RELOAD privilege. See GRANT.\n\nThe RESET statement is similar to FLUSH. See RESET.\n\nYou cannot issue a FLUSH statement from within a stored function or a trigger.\nDoing so within a stored procedure is permitted, as long as it is not called\nby a stored function or trigger. See Stored Routine Limitations, Stored\nFunction Limitations and Trigger Limitations.\n\nIf a listed table is a view, an error like the following will be produced:\n\nERROR 1347 (HY000): \'test.v\' is not BASE TABLE\n\nBy default, FLUSH statements are written to the binary log and will be\nreplicated. The NO_WRITE_TO_BINLOG keyword (LOCAL is an alias) will ensure the\nstatement is not written to the binary log.\n\nThe different flush options are:\n\n+---------------------------+------------------------------------------------+\n| Option                    | Description                                    |\n+---------------------------+------------------------------------------------+\n| CHANGED_PAGE_BITMAPS      | XtraDB only. Internal command used for backup  |\n|                           | purposes. See the Information Schema           |\n|                           | CHANGED_PAGE_BITMAPS Table.                    |\n+---------------------------+------------------------------------------------+\n| CLIENT_STATISTICS         | Reset client statistics (see SHOW              |\n|                           | CLIENT_STATISTICS).                            |\n+---------------------------+------------------------------------------------+\n| DES_KEY_FILE              | Reloads the DES key file (Specified with the   |\n|                           | --des-key-file startup option).                |\n+---------------------------+------------------------------------------------+\n| HOSTS                     | Flush the hostname cache (used for converting  |\n|                           | ip to host names and for unblocking blocked    |\n|                           | hosts. See max_connect_errors)                 |\n+---------------------------+------------------------------------------------+\n| INDEX_STATISTICS          | Reset index statistics (see SHOW               |\n|                           | INDEX_STATISTICS).                             |\n+---------------------------+------------------------------------------------+\n| [ERROR | ENGINE |         | Close and reopen the specified log type, or    |\n| GENERAL | SLOW | BINARY   | all log types if none are specified. FLUSH     |\n| | RELAY] LOGS             | RELAY LOGS [connection-name] can be used to    |\n|                           | flush the relay logs for a specific            |\n|                           | connection. Only one connection can be         |\n|                           | specified per FLUSH command. See Multi-source  |\n|                           | replication. FLUSH ENGINE LOGS will delete     |\n|                           | all unneeded Aria redo logs. Since MariaDB     |\n|                           | 10.1.30 and MariaDB 10.2.11, FLUSH BINARY      |\n|                           | LOGS DELETE_DOMAIN_ID=(list-of-domains) can    |\n|                           | be used to discard obsolete GTID domains from  |\n|                           | the server\'s binary log state. In order for    |\n|                           | this to be successful, no event group from     |\n|                           | the listed GTID domains can be present in      |\n|                           | existing binary log files. If some still       |\n|                           | exist, then they must be purged prior to       |\n|                           | executing this command. If the command         |\n|                           | completes successfully, then it also rotates   |\n|                           | the binary log.                                |\n+---------------------------+------------------------------------------------+\n| MASTER                    | Deprecated option, use RESET MASTER instead.   |\n+---------------------------+------------------------------------------------+\n| PRIVILEGES                | Reload all privileges from the privilege       |\n|                           | tables in the mysql database. If the server    |\n|                           | is started with --skip-grant-table option,     |\n|                           | this will activate the privilege tables again. |\n+---------------------------+------------------------------------------------+\n| QUERY CACHE               | Defragment the query cache to better utilize   |\n|                           | its memory. If you want to reset the query     |\n|                           | cache, you can do it with RESET QUERY CACHE.   |\n+---------------------------+------------------------------------------------+\n| QUERY_RESPONSE_TIME       | See the QUERY_RESPONSE_TIME plugin.            |\n+---------------------------+------------------------------------------------+\n| SLAVE                     | Deprecated option, use RESET REPLICA or RESET  |\n|                           | SLAVE instead.                                 |','','https://mariadb.com/kb/en/flush/');
update help_topic set description = CONCAT(description, '\n+---------------------------+------------------------------------------------+\n| SSL                       | Used to dynamically reinitialize the server\'s  |\n|                           | TLS context by reloading the files defined by  |\n|                           | several TLS system variables. See FLUSH SSL    |\n|                           | for more information. This command was first   |\n|                           | added in MariaDB 10.4.1.                       |\n+---------------------------+------------------------------------------------+\n| STATUS                    | Resets all server status variables that can    |\n|                           | be reset to 0. Not all global status           |\n|                           | variables support this, so not all global      |\n|                           | values are reset. See FLUSH STATUS for more    |\n|                           | information.                                   |\n+---------------------------+------------------------------------------------+\n| TABLE                     | Close tables given as options or all open      |\n|                           | tables if no table list was used. From         |\n|                           | MariaDB 10.4.1, using without any table list   |\n|                           | will only close tables not in use, and tables  |\n|                           | not locked by the FLUSH TABLES connection. If  |\n|                           | there are no locked tables, FLUSH TABLES will  |\n|                           | be instant and will not cause any waits, as    |\n|                           | it no longer waits for tables in use. When a   |\n|                           | table list is provided, from MariaDB 10.4.1,   |\n|                           | the server will wait for the end of any        |\n|                           | transactions that are using the tables.        |\n|                           | Previously, FLUSH TABLES only waited for the   |\n|                           | statements to complete.                        |\n+---------------------------+------------------------------------------------+\n| TABLES                    | Same as FLUSH TABLE.                           |\n+---------------------------+------------------------------------------------+\n| TABLES ... FOR EXPORT     | For InnoDB tables, flushes table changes to    |\n|                           | disk to permit binary table copies while the   |\n|                           | server is running. See FLUSH TABLES ... FOR    |\n|                           | EXPORT for more.                               |\n+---------------------------+------------------------------------------------+\n| TABLES WITH READ LOCK     | Closes all open tables. New tables are only    |\n|                           | allowed to be opened with read locks until an  |\n|                           | UNLOCK TABLES is given.                        |\n+---------------------------+------------------------------------------------+\n| TABLES WITH READ LOCK     | As TABLES WITH READ LOCK but also disable all  |\n| AND DISABLE CHECKPOINT    | checkpoint writes by transactional table       |\n|                           | engines. This is useful when doing a disk      |\n|                           | snapshot of all tables.                        |\n+---------------------------+------------------------------------------------+\n| TABLE_STATISTICS          | Reset table statistics (see SHOW               |\n|                           | TABLE_STATISTICS).                             |\n+---------------------------+------------------------------------------------+\n| USER_RESOURCES            | Resets all per hour user resources. This       |\n|                           | enables clients that have exhausted their      |\n|                           | resources to connect again.                    |\n+---------------------------+------------------------------------------------+\n| USER_STATISTICS           | Reset user statistics (see SHOW                |\n|                           | USER_STATISTICS).                              |\n+---------------------------+------------------------------------------------+\n| USER_VARIABLES            | Reset user variables (see User-defined         |\n|                           | variables).                                    |\n+---------------------------+------------------------------------------------+\n\nYou can also use the mysqladmin client to flush things. Use mysqladmin --help\nto examine what flush commands it supports.\n\nFLUSH RELAY LOGS\n----------------\n\nFLUSH RELAY LOGS \'connection_name\';\n\nCompatibility with MySQL\n------------------------\n\nMariaDB starting with 10.7.0\n----------------------------\nThe FOR CHANNEL keyword was added for MySQL compatibility. This is identical\nas using the channel_name directly after the FLUSH command.\n\nFor example, one can now use:\n\nFLUSH RELAY LOGS FOR CHANNEL \'connection_name\';\n\nFLUSH STATUS\n------------\n\nServer status variables can be reset by executing the following:\n\nFLUSH STATUS;\n\nGlobal Status Variables that Support FLUSH STATUS\n-------------------------------------------------\n\nNot all global status variables support being reset by FLUSH STATUS.\nCurrently, the following status variables are reset by FLUSH STATUS:\n\n* Aborted_clients\n* Aborted_connects\n* Binlog_cache_disk_use\n* Binlog_cache_use\n* Binlog_stmt_cache_disk_use\n* Binlog_stmt_cache_use\n* Connection_errors_accept\n* Connection_errors_internal') WHERE help_topic_id = 337;
update help_topic set description = CONCAT(description, '\n* Connection_errors_max_connections\n* Connection_errors_peer_address\n* Connection_errors_select\n* Connection_errors_tcpwrap\n* Created_tmp_files\n* Delayed_errors\n* Delayed_writes\n* Feature_check_constraint\n* Feature_delay_key_write\n* Max_used_connections\n* Opened_plugin_libraries\n* Performance_schema_accounts_lost\n* Performance_schema_cond_instances_lost\n* Performance_schema_digest_lost\n* Performance_schema_file_handles_lost\n* Performance_schema_file_instances_lost\n* Performance_schema_hosts_lost\n* Performance_schema_locker_lost\n* Performance_schema_mutex_instances_lost\n* Performance_schema_rwlock_instances_lost\n* Performance_schema_session_connect_attrs_lost\n* Performance_schema_socket_instances_lost\n* Performance_schema_stage_classes_lost\n* Performance_schema_statement_classes_lost\n* Performance_schema_table_handles_lost\n* Performance_schema_table_instances_lost\n* Performance_schema_thread_instances_lost\n* Performance_schema_users_lost\n* Qcache_hits\n* Qcache_inserts\n* Qcache_lowmem_prunes\n* Qcache_not_cached\n* Rpl_semi_sync_master_no_times\n* Rpl_semi_sync_master_no_tx\n* Rpl_semi_sync_master_timefunc_failures\n* Rpl_semi_sync_master_wait_pos_backtraverse\n* Rpl_semi_sync_master_yes_tx\n* Rpl_transactions_multi_engine\n* Server_audit_writes_failed\n* Slave_retried_transactions\n* Slow_launch_threads\n* Ssl_accept_renegotiates\n* Ssl_accepts\n* Ssl_callback_cache_hits\n* Ssl_client_connects\n* Ssl_connect_renegotiates\n* Ssl_ctx_verify_depth\n* Ssl_ctx_verify_mode\n* Ssl_finished_accepts\n* Ssl_finished_connects\n* Ssl_session_cache_hits\n* Ssl_session_cache_misses\n* Ssl_session_cache_overflows\n* Ssl_session_cache_size\n* Ssl_session_cache_timeouts\n* Ssl_sessions_reused\n* Ssl_used_session_cache_entries\n* Subquery_cache_hit\n* Subquery_cache_miss\n* Table_locks_immediate\n* Table_locks_waited\n* Tc_log_max_pages_used\n* Tc_log_page_waits\n* Transactions_gtid_foreign_engine\n* Transactions_multi_engine\n\nThe different usage of FLUSH TABLES\n-----------------------------------\n\nThe purpose of FLUSH TABLES\n---------------------------\n\nThe purpose of FLUSH TABLES is to clean up the open table cache and table\ndefinition cache from not in use tables. This frees up memory and file\ndescriptors. Normally this is not needed as the caches works on a FIFO bases,\nbut can be useful if the server seams to use up to much memory for some reason.\n\nThe purpose of FLUSH TABLES WITH READ LOCK \n-------------------------------------------\n\nFLUSH TABLES WITH READ LOCK is useful if you want to take a backup of some\ntables. When FLUSH TABLES WITH READ LOCK returns, all write access to tables\nare blocked and all tables are marked as \'properly closed\' on disk. The tables\ncan still be used for read operations.\n\nThe purpose of FLUSH TABLES table_list\n--------------------------------------\n\nFLUSH TABLES table_list is useful if you want to copy a table object/files to\nor from the server. This command puts a lock that stops new users of the table\nand will wait until everyone has stopped using the table. The table is then\nremoved from the table definition and table cache.\n\nNote that it\'s up to the user to ensure that no one is accessing the table\nbetween FLUSH TABLES and the table is copied to or from the server. This can\nbe secured by using LOCK TABLES.\n\nIf there are any tables locked by the connection that is using FLUSH TABLES\nall the locked tables will be closed as part of the flush and reopened and\nrelocked before FLUSH TABLES returns. This allows one to copy the table after\nFLUSH TABLES returns without having any writes on the table. For now this\nworks works with most tables, except InnoDB as InnoDB may do background purges\non the table even while it\'s write locked.\n\nThe purpose of FLUSH TABLES table_list WITH READ LOCK\n-----------------------------------------------------\n\nFLUSH TABLES table_list WITH READ LOCK should work as FLUSH TABLES WITH READ\nLOCK, but only those tables that are listed will be properly closed. However\nin practice this works exactly like FLUSH TABLES WITH READ LOCK as the FLUSH\ncommand has anyway to wait for all WRITE operations to end because we are\ndepending on a global read lock for this code. In the future we should\nconsider fixing this to instead use meta data locks.\n\nImplementation of FLUSH TABLES commands in MariaDB 10.4.8 and above\n-------------------------------------------------------------------\n\nImplementation of FLUSH TABLES\n------------------------------\n\n* Free memory and file descriptors not in use\n\nImplementation of FLUSH TABLES WITH READ LOCK\n---------------------------------------------\n\n* Lock all tables read only for simple old style backup.\n* All background writes are suspended and tables are marked as closed.\n* No statement requiring table changes are allowed for any user until UNLOCK\nTABLES.\n\nInstead of using FLUSH TABLE WITH READ LOCK one should in most cases instead\nuse BACKUP STAGE BLOCK_COMMIT.\n\nImplementation of FLUSH TABLES table_list\n-----------------------------------------\n\n* Free memory and file descriptors for tables not in use from table list.\n* Lock given tables as read only.\n* Wait until all translations has ended that uses any of the given tables.\n* Wait until all background writes are suspended and tables are marked as\nclosed.\n\nImplementation of FLUSH TABLES table_list FOR EXPORT\n----------------------------------------------------\n\n* Free memory and file descriptors for tables not in use from table list\n* Lock given tables as read.') WHERE help_topic_id = 337;
update help_topic set description = CONCAT(description, '\n* Wait until all background writes are suspended and tables are marked as\nclosed.\n* Check that all tables supports FOR EXPORT\n* No changes to these tables allowed until UNLOCK TABLES\n\nThis is basically the same behavior as in old MariaDB version if one first\nlock the tables, then do FLUSH TABLES. The tables will be copyable until\nUNLOCK TABLES.\n\nFLUSH SSL\n---------\n\nMariaDB starting with 10.4\n--------------------------\nThe FLUSH SSL command was first added in MariaDB 10.4.\n\nIn MariaDB 10.4 and later, the FLUSH SSL command can be used to dynamically\nreinitialize the server\'s TLS context. This is most useful if you need to\nreplace a certificate that is about to expire without restarting the server.\n\nThis operation is performed by reloading the files defined by the following\nTLS system variables:\n\n* ssl_cert\n* ssl_key\n* ssl_ca\n* ssl_capath\n* ssl_crl\n* ssl_crlpath\n\nThese TLS system variables are not dynamic, so their values can not be changed\nwithout restarting the server.\n\nIf you want to dynamically reinitialize the server\'s TLS context, then you\nneed to change the certificate and key files at the relevant paths defined by\nthese TLS system variables, without actually changing the values of the\nvariables. See MDEV-19341 for more information.\n\nReducing Memory Usage\n---------------------\n\nTo flush some of the global caches that take up memory, you could execute the\nfollowing command:\n\nFLUSH LOCAL HOSTS,\n QUERY CACHE,\n TABLE_STATISTICS,\n INDEX_STATISTICS,\n USER_STATISTICS;\n\nURL: https://mariadb.com/kb/en/flush/') WHERE help_topic_id = 337;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (338,26,'FLUSH QUERY CACHE','Description\n-----------\n\nYou can defragment the query cache to better utilize its memory with the FLUSH\nQUERY CACHE statement. The statement does not remove any queries from the\ncache.\n\nThe RESET QUERY CACHE statement removes all query results from the query\ncache. The FLUSH TABLES statement also does this.\n\nURL: https://mariadb.com/kb/en/flush-query-cache/','','https://mariadb.com/kb/en/flush-query-cache/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (339,26,'FLUSH TABLES FOR EXPORT','Syntax\n------\n\nFLUSH TABLES table_name [, table_name] FOR EXPORT\n\nDescription\n-----------\n\nFLUSH TABLES ... FOR EXPORT flushes changes to the specified tables to disk so\nthat binary copies can be made while the server is still running. This works\nfor Archive, Aria, CSV, InnoDB, MyISAM, MERGE, and XtraDB tables.\n\nThe table is read locked until one has issued UNLOCK TABLES.\n\nIf a storage engine does not support FLUSH TABLES FOR EXPORT, a 1031 error\n(SQLSTATE \'HY000\') is produced.\n\nIf FLUSH TABLES ... FOR EXPORT is in effect in the session, the following\nstatements will produce an error if attempted:\n\n* FLUSH TABLES WITH READ LOCK\n* FLUSH TABLES ... WITH READ LOCK\n* FLUSH TABLES ... FOR EXPORT\n* Any statement trying to update any table\n\nIf any of the following statements is in effect in the session, attempting\nFLUSH TABLES ... FOR EXPORT will produce an error.\n\n* FLUSH TABLES ... WITH READ LOCK\n* FLUSH TABLES ... FOR EXPORT\n* LOCK TABLES ... READ\n* LOCK TABLES ... WRITE\n\nFLUSH FOR EXPORT is not written to the binary log.\n\nThis statement requires the RELOAD and the LOCK TABLES privileges.\n\nIf one of the specified tables cannot be locked, none of the tables will be\nlocked.\n\nIf a table does not exist, an error like the following will be produced:\n\nERROR 1146 (42S02): Table \'test.xxx\' doesn\'t exist\n\nIf a table is a view, an error like the following will be produced:\n\nERROR 1347 (HY000): \'test.v\' is not BASE TABLE\n\nExample\n-------\n\nFLUSH TABLES test.t1 FOR EXPORT;\n#  Copy files related to the table (see below)\nUNLOCK TABLES;\n\nFor a full description, please see copying MariaDB tables.\n\nURL: https://mariadb.com/kb/en/flush-tables-for-export/','','https://mariadb.com/kb/en/flush-tables-for-export/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (340,26,'SHOW RELAYLOG EVENTS','The terms master and slave have historically been used in replication, but the\nterms terms primary and replica are now preferred. The old terms are used\nstill used in parts of the documentation, and in MariaDB commands, although\nMariaDB 10.5 has begun the process of renaming. The documentation process is\nongoing. See MDEV-18777 to follow progress on this effort.\n\nSyntax\n------\n\nSHOW RELAYLOG [\'connection_name\'] EVENTS\n  [IN \'log_name\'] [FROM pos] [LIMIT [offset,] row_count]\n  [ FOR CHANNEL \'channel_name\']\n\nDescription\n-----------\n\nOn replicas, this command shows the events in the relay log. If \'log_name\' is\nnot specified, the first relay log is shown.\n\nSyntax for the LIMIT clause is the same as for SELECT ... LIMIT.\n\nUsing the LIMIT clause is highly recommended because the SHOW RELAYLOG EVENTS\ncommand returns the complete contents of the relay log, which can be quite\nlarge.\n\nThis command does not return events related to setting user and system\nvariables. If you need those, use mariadb-binlog/mysqlbinlog.\n\nOn the primary, this command does nothing.\n\nRequires the REPLICA MONITOR privilege (>= MariaDB 10.5.9), the REPLICATION\nSLAVE ADMIN privilege (>= MariaDB 10.5.2) or the REPLICATION SLAVE privilege\n(<= MariaDB 10.5.1).\n\nconnection_name\n---------------\n\nIf there is only one nameless primary, or the default primary (as specified by\nthe default_master_connection system variable) is intended, connection_name\ncan be omitted. If provided, the SHOW RELAYLOG statement will apply to the\nspecified primary. connection_name is case-insensitive.\n\nMariaDB starting with 10.7.0\n----------------------------\nThe FOR CHANNEL keyword was added for MySQL compatibility. This is identical\nas using the channel_name directly after SHOW RELAYLOG.\n\nURL: https://mariadb.com/kb/en/show-relaylog-events/','','https://mariadb.com/kb/en/show-relaylog-events/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (341,26,'SHOW SLAVE STATUS','Syntax\n------\n\nSHOW SLAVE [\"connection_name\"] STATUS [FOR CHANNEL \"connection_name\"]\nSHOW REPLICA [\"connection_name\"] STATUS -- From MariaDB 10.5.1\n\nor\n\nSHOW ALL SLAVES STATUS\nSHOW ALL REPLICAS STATUS -- From MariaDB 10.5.1\n\nDescription\n-----------\n\nThis statement is to be run on a replica and provides status information on\nessential parameters of the replica threads.\n\nThis statement requires the SUPER privilege, the REPLICATION_CLIENT privilege,\nor, from MariaDB 10.5.2, the REPLICATION SLAVE ADMIN privilege, or, from\nMariaDB 10.5.9, the REPLICA MONITOR privilege.\n\nMulti-Source\n------------\n\nThe ALL and \"connection_name\" options allow you to connect to many primaries\nat the same time.\n\nALL SLAVES (or ALL REPLICAS from MariaDB 10.5.1) gives you a list of all\nconnections to the primary nodes.\n\nThe rows will be sorted according to Connection_name.\n\nIf you specify a connection_name, you only get the information about that\nconnection. If connection_name is not used, then the name set by\ndefault_master_connection is used. If the connection name doesn\'t exist you\nwill get an error: There is no master connection for \'xxx\'.\n\nMariaDB starting with 10.7.0\n----------------------------\nThe FOR CHANNEL keyword was added for MySQL compatibility. This is identical\nas using the channel_name directly after SHOW SLAVE.\n\nColumn Descriptions\n-------------------\n\n+---------------+---------------------------------------+-------------------+\n| Name          | Description                           | Added             |\n+---------------+---------------------------------------+-------------------+\n| Connection_na | Name of the primary connection.       |                   |\n| e             | Returned with SHOW ALL SLAVES STATUS  |                   |\n|               | (or SHOW ALL REPLICAS STATUS from     |                   |\n|               | MariaDB 10.5.1) only.                 |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_SQL_Sta | State of SQL thread. Returned with    |                   |\n| e             | SHOW ALL SLAVES STATUS (or SHOW ALL   |                   |\n|               | REPLICAS STATUS from MariaDB 10.5.1)  |                   |\n|               | only. See Slave SQL Thread States.    |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_IO_Stat | State of I/O thread. See Slave I/O    |                   |\n|               | Thread States.                        |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_host   | Master host that the replica is       |                   |\n|               | connected to.                         |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_user   | Account user name being used to       |                   |\n|               | connect to the primary.               |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_port   | The port being used to connect to     |                   |\n|               | the primary.                          |                   |\n+---------------+---------------------------------------+-------------------+\n| Connect_Retry | Time in seconds between retries to    |                   |\n|               | connect. The default is 60. The       |                   |\n|               | CHANGE MASTER TO statement can set    |                   |\n|               | this. The master-retry-count option   |                   |\n|               | determines the maximum number of      |                   |\n|               | reconnection attempts.                |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_Log_Fi | Name of the primary binary log file   |                   |\n| e             | that the I/O thread is currently      |                   |\n|               | reading from.                         |                   |\n+---------------+---------------------------------------+-------------------+\n| Read_Master_L | Position up to which the I/O thread   |                   |\n| g_Pos         | has read in the current primary       |                   |\n|               | binary log file.                      |                   |\n+---------------+---------------------------------------+-------------------+\n| Relay_Log_Fil | Name of the relay log file that the   |                   |\n|               | SQL thread is currently processing.   |                   |\n+---------------+---------------------------------------+-------------------+\n| Relay_Log_Pos | Position up to which the SQL thread   |                   |\n|               | has finished processing in the        |                   |\n|               | current relay log file.               |                   |\n+---------------+---------------------------------------+-------------------+\n| Relay_Master_ | Name of the primary binary log file   |                   |\n| og_File       | that contains the most recent event   |                   |\n|               | executed by the SQL thread.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_IO_Runn | Whether the replica I/O thread is     |                   |','','https://mariadb.com/kb/en/show-replica-status/');
update help_topic set description = CONCAT(description, '\n| ng            | running and connected (Yes), running  |                   |\n|               | but not connected to a primary        |                   |\n|               | (Connecting) or not running (No).     |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_SQL_Run | Whether or not the SQL thread is      |                   |\n| ing           | running.                              |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Do_ | Databases specified for replicating   |                   |\n| B             | with the replicate_do_db option.      |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Ign | Databases specified for ignoring      |                   |\n| re_DB         | with the replicate_ignore_db option.  |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Do_ | Tables specified for replicating      |                   |\n| able          | with the replicate_do_table option.   |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Ign | Tables specified for ignoring with    |                   |\n| re_Table      | the replicate_ignore_table option.    |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Wil | Tables specified for replicating      |                   |\n| _Do_Table     | with the replicate_wild_do_table      |                   |\n|               | option.                               |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Wil | Tables specified for ignoring with    |                   |\n| _Ignore_Table | the replicate_wild_ignore_table       |                   |\n|               | option.                               |                   |\n+---------------+---------------------------------------+-------------------+\n| Last_Errno    | Alias for Last_SQL_Errno (see below)  |                   |\n+---------------+---------------------------------------+-------------------+\n| Last Error    | Alias for Last_SQL_Error (see below)  |                   |\n+---------------+---------------------------------------+-------------------+\n| Skip_Counter  | Number of events that a replica       |                   |\n|               | skips from the master, as recorded    |                   |\n|               | in the sql_slave_skip_counter system  |                   |\n|               | variable.                             |                   |\n+---------------+---------------------------------------+-------------------+\n| Exec_Master_L | Position up to which the SQL thread   |                   |\n| g_Pos         | has processed in the current master   |                   |\n|               | binary log file. Can be used to       |                   |\n|               | start a new replica from a current    |                   |\n|               | replica with the CHANGE MASTER TO     |                   |\n|               | ... MASTER_LOG_POS option.            |                   |\n+---------------+---------------------------------------+-------------------+\n| Relay_Log_Spa | Total size of all relay log files     |                   |\n| e             | combined.                             |                   |\n+---------------+---------------------------------------+-------------------+\n| Until_Conditi |                                       |                   |\n| n             |                                       |                   |\n+---------------+---------------------------------------+-------------------+\n| Until_Log_Fil | The MASTER_LOG_FILE value of the      |                   |\n|               | START SLAVE UNTIL condition.          |                   |\n+---------------+---------------------------------------+-------------------+\n| Until_Log_Pos | The MASTER_LOG_POS value of the       |                   |\n|               | START SLAVE UNTIL condition.          |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Al | Whether an SSL connection is          |                   |\n| owed          | permitted (Yes), not permitted (No)   |                   |\n|               | or permitted but without the replica  |                   |\n|               | having SSL support enabled (Ignored)  |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_CA | The MASTER_SSL_CA option of the       |                   |\n| File          | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_CA | The MASTER_SSL_CAPATH option of the   |                   |\n| Path          | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Ce | The MASTER_SSL_CERT option of the     |                   |\n| t             | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Ci | The MASTER_SSL_CIPHER option of the   |                   |') WHERE help_topic_id = 341;
update help_topic set description = CONCAT(description, '\n| her           | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Ke | The MASTER_SSL_KEY option of the      |                   |\n|               | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Seconds_Behin | Difference between the timestamp      |                   |\n| _Master       | logged on the master for the event    |                   |\n|               | that the replica is currently         |                   |\n|               | processing, and the current           |                   |\n|               | timestamp on the replica. Zero if     |                   |\n|               | the replica is not currently          |                   |\n|               | processing an event. With parallel    |                   |\n|               | replication, seconds_behind_master    |                   |\n|               | is updated only after transactions    |                   |\n|               | commit.                               |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Ve | The MASTER_SSL_VERIFY_SERVER_CERT     |                   |\n| ify_Server_Ce | option of the CHANGE MASTER TO        |                   |\n| t             | statement.                            |                   |\n+---------------+---------------------------------------+-------------------+\n| Last_IO_Errno | Error code of the most recent error   |                   |\n|               | that caused the I/O thread to stop    |                   |\n|               | (also recorded in the replica\'s       |                   |\n|               | error log). 0 means no error. RESET   |                   |\n|               | SLAVE or RESET MASTER will reset      |                   |\n|               | this value.                           |                   |\n+---------------+---------------------------------------+-------------------+\n| Last_IO_Error | Error message of the most recent      |                   |\n|               | error that caused the I/O thread to   |                   |\n|               | stop (also recorded in the replica\'s  |                   |\n|               | error log). An empty string means no  |                   |\n|               | error. RESET SLAVE or RESET MASTER    |                   |\n|               | will reset this value.                |                   |\n+---------------+---------------------------------------+-------------------+\n| Last_SQL_Errn | Error code of the most recent error   |                   |\n|               | that caused the SQL thread to stop    |                   |\n|               | (also recorded in the replica\'s       |                   |\n|               | error log). 0 means no error. RESET   |                   |\n|               | SLAVE or RESET MASTER will reset      |                   |\n|               | this value.                           |                   |\n+---------------+---------------------------------------+-------------------+\n| Last_SQL_Erro | Error message of the most recent      |                   |\n|               | error that caused the SQL thread to   |                   |\n|               | stop (also recorded in the replica\'s  |                   |\n|               | error log). An empty string means no  |                   |\n|               | error. RESET SLAVE or RESET MASTER    |                   |\n|               | will reset this value.                |                   |\n+---------------+---------------------------------------+-------------------+\n| Replicate_Ign | List of server_ids that are           |                   |\n| re_Server_Ids | currently being ignored for           |                   |\n|               | replication purposes, or an empty     |                   |\n|               | string for none, as specified in the  |                   |\n|               | IGNORE_SERVER_IDS option of the       |                   |\n|               | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_Server | The master\'s server_id value.         |                   |\n| Id            |                                       |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Cr | The MASTER_SSL_CRL option of the      |                   |\n|               | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Master_SSL_Cr | The MASTER_SSL_CRLPATH option of the  |                   |\n| path          | CHANGE MASTER TO statement.           |                   |\n+---------------+---------------------------------------+-------------------+\n| Using_Gtid    | Whether or not global transaction     |                   |\n|               | ID\'s are being used for replication   |                   |\n|               | (can be No, Slave_Pos, or             |                   |\n|               | Current_Pos).                         |                   |\n+---------------+---------------------------------------+-------------------+\n| Gtid_IO_Pos   | Current global transaction ID value.  |                   |') WHERE help_topic_id = 341;
update help_topic set description = CONCAT(description, '\n+---------------+---------------------------------------+-------------------+\n| Retried_trans | Number of retried transactions for    |                   |\n| ctions        | this connection. Returned with SHOW   |                   |\n|               | ALL SLAVES STATUS only.               |                   |\n+---------------+---------------------------------------+-------------------+\n| Max_relay_log | Max relay log size for this           |                   |\n| size          | connection. Returned with SHOW ALL    |                   |\n|               | SLAVES STATUS only.                   |                   |\n+---------------+---------------------------------------+-------------------+\n| Executed_log_ | How many log entries the replica has  |                   |\n| ntries        | executed. Returned with SHOW ALL      |                   |\n|               | SLAVES STATUS only.                   |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_receive | How many heartbeats we have got from  |                   |\n| _heartbeats   | the master. Returned with SHOW ALL    |                   |\n|               | SLAVES STATUS only.                   |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_heartbe | How often to request a heartbeat      |                   |\n| t_period      | packet from the master (in seconds).  |                   |\n|               | Returned with SHOW ALL SLAVES STATUS  |                   |\n|               | only.                                 |                   |\n+---------------+---------------------------------------+-------------------+\n| Gtid_Slave_Po | GTID of the last event group          |                   |\n|               | replicated on a replica server, for   |                   |\n|               | each replication domain, as stored    |                   |\n|               | in the gtid_slave_pos system          |                   |\n|               | variable. Returned with SHOW ALL      |                   |\n|               | SLAVES STATUS only.                   |                   |\n+---------------+---------------------------------------+-------------------+\n| SQL_Delay     | Value specified by MASTER_DELAY in    | MariaDB 10.2.3    |\n|               | CHANGE MASTER (or 0 if none).         |                   |\n+---------------+---------------------------------------+-------------------+\n| SQL_Remaining | When the replica is delaying the      | MariaDB 10.2.3    |\n| Delay         | execution of an event due to          |                   |\n|               | MASTER_DELAY, this is the number of   |                   |\n|               | seconds of delay remaining before     |                   |\n|               | the event will be applied.            |                   |\n|               | Otherwise, the value is NULL.         |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_SQL_Run | The state of the SQL driver threads,  | MariaDB 10.2.3    |\n| ing_State     | same as in SHOW PROCESSLIST. When     |                   |\n|               | the replica is delaying the           |                   |\n|               | execution of an event due to          |                   |\n|               | MASTER_DELAY, this field displays:    |                   |\n|               | \"Waiting until MASTER_DELAY seconds   |                   |\n|               | after master executed event\".         |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_DDL_Gro | This status variable counts the       | MariaDB 10.3.7    |\n| ps            | occurrence of DDL statements.  This   |                   |\n|               | is a replica-side counter for         |                   |\n|               | optimistic parallel replication.      |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_Non_Tra | This status variable counts the       | MariaDB 10.3.7    |\n| sactional_Gro | occurrence of non-transactional       |                   |\n| ps            | event groups.  This is a              |                   |\n|               | replica-side counter for optimistic   |                   |\n|               | parallel replication.                 |                   |\n+---------------+---------------------------------------+-------------------+\n| Slave_Transac | This status variable counts the       | MariaDB 10.3.7    |\n| ional_Groups  | occurrence of transactional event     |                   |\n|               | groups.  This is a replica-side       |                   |\n|               | counter for optimistic parallel       |                   |\n|               | replication.                          |                   |\n+---------------+---------------------------------------+-------------------+\n\nSHOW REPLICA STATUS\n-------------------\n\nMariaDB starting with 10.5.1\n----------------------------\nSHOW REPLICA STATUS is an alias for SHOW SLAVE STATUS from MariaDB 10.5.1.\n\nExamples\n--------\n\nIf you issue this statement using the mysql client, you can use a \\G statement\nterminator rather than a semicolon to obtain a more readable vertical layout.\n\nSHOW SLAVE STATUS\\G\n*************************** 1. row ***************************\n       Slave_IO_State: Waiting for master to send event') WHERE help_topic_id = 341;
update help_topic set description = CONCAT(description, '\n         Master_Host: db01.example.com\n         Master_User: replicant\n         Master_Port: 3306\n        Connect_Retry: 60\n       Master_Log_File: mariadb-bin.000010\n     Read_Master_Log_Pos: 548\n       Relay_Log_File: relay-bin.000004\n        Relay_Log_Pos: 837\n    Relay_Master_Log_File: mariadb-bin.000010\n      Slave_IO_Running: Yes\n      Slave_SQL_Running: Yes\n       Replicate_Do_DB:\n     Replicate_Ignore_DB:\n     Replicate_Do_Table:\n   Replicate_Ignore_Table:\n   Replicate_Wild_Do_Table:\n Replicate_Wild_Ignore_Table:\n         Last_Errno: 0\n         Last_Error:\n        Skip_Counter: 0\n     Exec_Master_Log_Pos: 548\n       Relay_Log_Space: 1497\n       Until_Condition: None\n       Until_Log_File:\n        Until_Log_Pos: 0\n     Master_SSL_Allowed: No\n     Master_SSL_CA_File:\n     Master_SSL_CA_Path:\n       Master_SSL_Cert:\n      Master_SSL_Cipher:\n       Master_SSL_Key:\n    Seconds_Behind_Master: 0\nMaster_SSL_Verify_Server_Cert: No\n        Last_IO_Errno: 0\n        Last_IO_Error:\n       Last_SQL_Errno: 0\n       Last_SQL_Error:\n Replicate_Ignore_Server_Ids:\n      Master_Server_Id: 101\n       Master_SSL_Crl:\n     Master_SSL_Crlpath:\n         Using_Gtid: No\n         Gtid_IO_Pos:\n\nSHOW ALL SLAVES STATUS\\G\n*************************** 1. row ***************************\n       Connection_name:\n       Slave_SQL_State: Slave has read all relay log; waiting for the\nslave I/O thread to update it\n       Slave_IO_State: Waiting for master to send event\n         Master_Host: db01.example.com\n         Master_User: replicant\n         Master_Port: 3306\n        Connect_Retry: 60\n       Master_Log_File: mariadb-bin.000010\n     Read_Master_Log_Pos: 3608\n       Relay_Log_File: relay-bin.000004\n        Relay_Log_Pos: 3897\n    Relay_Master_Log_File: mariadb-bin.000010\n      Slave_IO_Running: Yes\n      Slave_SQL_Running: Yes\n       Replicate_Do_DB:\n     Replicate_Ignore_DB:\n     Replicate_Do_Table:\n   Replicate_Ignore_Table:\n   Replicate_Wild_Do_Table:\n Replicate_Wild_Ignore_Table:\n         Last_Errno: 0\n         Last_Error:\n        Skip_Counter: 0\n     Exec_Master_Log_Pos: 3608\n       Relay_Log_Space: 4557\n       Until_Condition: None\n       Until_Log_File:\n        Until_Log_Pos: 0\n     Master_SSL_Allowed: No\n     Master_SSL_CA_File:\n     Master_SSL_CA_Path:\n       Master_SSL_Cert:\n      Master_SSL_Cipher:\n       Master_SSL_Key:\n    Seconds_Behind_Master: 0\nMaster_SSL_Verify_Server_Cert: No\n        Last_IO_Errno: 0\n        Last_IO_Error:\n       Last_SQL_Errno: 0\n       Last_SQL_Error:\n Replicate_Ignore_Server_Ids:\n      Master_Server_Id: 101\n       Master_SSL_Crl:\n     Master_SSL_Crlpath:\n         Using_Gtid: No\n         Gtid_IO_Pos:\n    Retried_transactions: 0\n     Max_relay_log_size: 104857600\n    Executed_log_entries: 40\n  Slave_received_heartbeats: 11\n   Slave_heartbeat_period: 1800.000\n       Gtid_Slave_Pos: 0-101-2320\n\nYou can also access some of the variables directly from status variables:\n\nSET @@default_master_connection=\"test\" ;\nshow status like \"%slave%\"\n\nVariable_name   Value\nCom_show_slave_hosts    0\nCom_show_slave_status   0\nCom_start_all_slaves    0\nCom_start_slave 0\nCom_stop_all_slaves     0\nCom_stop_slave  0\nRpl_semi_sync_slave_status      OFF\nSlave_connections       0\nSlave_heartbeat_period  1800.000\nSlave_open_temp_tables  0\nSlave_received_heartbeats       0\nSlave_retried_transactions      0\nSlave_running   OFF\nSlaves_connected        0\nSlaves_running  1\n\nURL: https://mariadb.com/kb/en/show-replica-status/') WHERE help_topic_id = 341;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (342,26,'SHOW MASTER STATUS','Syntax\n------\n\nSHOW MASTER STATUS\nSHOW BINLOG STATUS -- From MariaDB 10.5.2\n\nDescription\n-----------\n\nProvides status information about the binary log files of the primary.\n\nThis statement requires the SUPER privilege, the REPLICATION_CLIENT privilege,\nor, from MariaDB 10.5.2, the BINLOG MONITOR privilege.\n\nTo see information about the current GTIDs in the binary log, use the\ngtid_binlog_pos variable.\n\nSHOW MASTER STATUS was renamed to SHOW BINLOG STATUS in MariaDB 10.5.2, but\nthe old name remains an alias for compatibility purposes.\n\nExample\n-------\n\nSHOW MASTER STATUS;\n+--------------------+----------+--------------+------------------+\n| File               | Position | Binlog_Do_DB | Binlog_Ignore_DB |\n+--------------------+----------+--------------+------------------+\n| mariadb-bin.000016 |      475 |              |                  |\n+--------------------+----------+--------------+------------------+\nSELECT @@global.gtid_binlog_pos;\n+--------------------------+\n| @@global.gtid_binlog_pos |\n+--------------------------+\n| 0-1-2                    |\n+--------------------------+\n\nURL: https://mariadb.com/kb/en/show-binlog-status/','','https://mariadb.com/kb/en/show-binlog-status/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (343,26,'SHOW SLAVE HOSTS','Syntax\n------\n\nSHOW SLAVE HOSTS\nSHOW REPLICA HOSTS -- from MariaDB 10.5.1\n\nDescription\n-----------\n\nThis command is run on the primary and displays a list of replicas that are\ncurrently registered with it. Only replicas started with the\n--report-host=host_name option are visible in this list.\n\nThe list is displayed on any server (not just the primary server). The output\nlooks like this:\n\nSHOW SLAVE HOSTS;\n+------------+-----------+------+-----------+\n| Server_id  | Host      | Port | Master_id |\n+------------+-----------+------+-----------+\n|  192168010 | iconnect2 | 3306 | 192168011 |\n| 1921680101 | athena    | 3306 | 192168011 |\n+------------+-----------+------+-----------+\n\n* Server_id: The unique server ID of the replica server, as configured in the\nserver\'s option file, or on the command line with --server-id=value.\n* Host: The host name of the replica server, as configured in the server\'s\noption file, or on the command line with --report-host=host_name. Note that\nthis can differ from the machine name as configured in the operating system.\n* Port: The port the replica server is listening on.\n* Master_id: The unique server ID of the primary server that the replica\nserver is replicating from.\n\nSome MariaDB and MySQL versions report another variable, rpl_recovery_rank.\nThis variable was never used, and was eventually removed in MariaDB 10.1.2 .\n\nRequires the REPLICATION MASTER ADMIN privilege (>= MariaDB 10.5.2) or the\nREPLICATION SLAVE privilege (<= MariaDB 10.5.1).\n\nSHOW REPLICA HOSTS\n------------------\n\nMariaDB starting with 10.5.1\n----------------------------\nSHOW REPLICA HOSTS is an alias for SHOW SLAVE HOSTS from MariaDB 10.5.1.\n\nURL: https://mariadb.com/kb/en/show-replica-hosts/','','https://mariadb.com/kb/en/show-replica-hosts/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (344,26,'SHOW PLUGINS','Syntax\n------\n\nSHOW PLUGINS;\n\nDescription\n-----------\n\nSHOW PLUGINS displays information about installed plugins. The Library column\nindicates the plugin library - if it is NULL, the plugin is built-in and\ncannot be uninstalled.\n\nThe PLUGINS table in the information_schema database contains more detailed\ninformation.\n\nFor specific information about storage engines (a particular type of plugin),\nsee the information_schema.ENGINES table and the SHOW ENGINES statement.\n\nExamples\n--------\n\nSHOW PLUGINS;\n+----------------------------+----------+--------------------+-------------+---\n-----+\n| Name                       | Status   | Type               | Library     |\nLicense |\n+----------------------------+----------+--------------------+-------------+---\n-----+\n| binlog                     | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| mysql_native_password      | ACTIVE   | AUTHENTICATION     | NULL        |\nGPL     |\n| mysql_old_password         | ACTIVE   | AUTHENTICATION     | NULL        |\nGPL     |\n| MRG_MyISAM                 | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| MyISAM                     | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| CSV                        | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| MEMORY                     | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| FEDERATED                  | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| PERFORMANCE_SCHEMA         | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| Aria                       | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| InnoDB                     | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| INNODB_TRX                 | ACTIVE   | INFORMATION SCHEMA | NULL        |\nGPL     |\n...\n| INNODB_SYS_FOREIGN         | ACTIVE   | INFORMATION SCHEMA | NULL        |\nGPL     |\n| INNODB_SYS_FOREIGN_COLS    | ACTIVE   | INFORMATION SCHEMA | NULL        |\nGPL     |\n| SPHINX                     | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| ARCHIVE                    | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| BLACKHOLE                  | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| FEEDBACK                   | DISABLED | INFORMATION SCHEMA | NULL        |\nGPL     |\n| partition                  | ACTIVE   | STORAGE ENGINE     | NULL        |\nGPL     |\n| pam                        | ACTIVE   | AUTHENTICATION     | auth_pam.so |\nGPL     |\n+----------------------------+----------+--------------------+-------------+---\n-----+\n\nURL: https://mariadb.com/kb/en/show-plugins/','','https://mariadb.com/kb/en/show-plugins/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (345,26,'SHOW PLUGINS SONAME','Syntax\n------\n\nSHOW PLUGINS SONAME { library | LIKE \'pattern\' | WHERE expr };\n\nDescription\n-----------\n\nSHOW PLUGINS SONAME displays information about compiled-in and all server\nplugins in the plugin_dir directory, including plugins that haven\'t been\ninstalled.\n\nExamples\n--------\n\nSHOW PLUGINS SONAME \'ha_example.so\';\n+----------+---------------+----------------+---------------+---------+\n| Name     | Status        | Type           | Library       | License |\n+----------+---------------+----------------+---------------+---------+\n| EXAMPLE  | NOT INSTALLED | STORAGE ENGINE | ha_example.so | GPL     |\n| UNUSABLE | NOT INSTALLED | DAEMON         | ha_example.so | GPL     |\n+----------+---------------+----------------+---------------+---------+\n\nThere is also a corresponding information_schema table, called ALL_PLUGINS,\nwhich contains more complete information.\n\nURL: https://mariadb.com/kb/en/show-plugins-soname/','','https://mariadb.com/kb/en/show-plugins-soname/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (346,26,'SET','Syntax\n------\n\nSET variable_assignment [, variable_assignment] ...\n\nvariable_assignment:\n   user_var_name = expr\n  | [GLOBAL | SESSION] system_var_name = expr\n  | [@@global. | @@session. | @@]system_var_name = expr\n\nOne can also set a user variable in any expression with this syntax:\n\nuser_var_name:= expr\n\nDescription\n-----------\n\nThe SET statement assigns values to different types of variables that affect\nthe operation of the server or your client. Older versions of MySQL employed\nSET OPTION, but this syntax was deprecated in favor of SET without OPTION, and\nwas removed in MariaDB 10.0.\n\nChanging a system variable by using the SET statement does not make the change\npermanently. To do so, the change must be made in a configuration file.\n\nFor setting variables on a per-query basis, see SET STATEMENT.\n\nSee SHOW VARIABLES for documentation on viewing server system variables.\n\nSee Server System Variables for a list of all the system variables.\n\nGLOBAL / SESSION\n----------------\n\nWhen setting a system variable, the scope can be specified as either GLOBAL or\nSESSION.\n\nA global variable change affects all new sessions. It does not affect any\ncurrently open sessions, including the one that made the change.\n\nA session variable change affects the current session only.\n\nIf the variable has a session value, not specifying either GLOBAL or SESSION\nwill be the same as specifying SESSION. If the variable only has a global\nvalue, not specifying GLOBAL or SESSION will apply to the change to the global\nvalue.\n\nDEFAULT\n-------\n\nSetting a global variable to DEFAULT will restore it to the server default,\nand setting a session variable to DEFAULT will restore it to the current\nglobal value.\n\nExamples\n--------\n\n* innodb_sync_spin_loops is a global variable.\n* skip_parallel_replication is a session variable.\n* max_error_count is both global and session.\n\nSELECT VARIABLE_NAME, SESSION_VALUE, GLOBAL_VALUE FROM\n INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE \n VARIABLE_NAME IN (\'max_error_count\', \'skip_parallel_replication\',\n\'innodb_sync_spin_loops\');\n+---------------------------+---------------+--------------+\n| VARIABLE_NAME             | SESSION_VALUE | GLOBAL_VALUE |\n+---------------------------+---------------+--------------+\n| MAX_ERROR_COUNT           | 64            | 64           |\n| SKIP_PARALLEL_REPLICATION | OFF           | NULL         |\n| INNODB_SYNC_SPIN_LOOPS    | NULL          | 30           |\n+---------------------------+---------------+--------------+\n\nSetting the session values:\n\nSET max_error_count=128;Query OK, 0 rows affected (0.000 sec)\n\nSET skip_parallel_replication=ON;Query OK, 0 rows affected (0.000 sec)\n\nSET innodb_sync_spin_loops=60;\nERROR 1229 (HY000): Variable \'innodb_sync_spin_loops\' is a GLOBAL variable \n and should be set with SET GLOBAL\n\nSELECT VARIABLE_NAME, SESSION_VALUE, GLOBAL_VALUE FROM\n INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE \n VARIABLE_NAME IN (\'max_error_count\', \'skip_parallel_replication\',\n\'innodb_sync_spin_loops\');\n+---------------------------+---------------+--------------+\n| VARIABLE_NAME             | SESSION_VALUE | GLOBAL_VALUE |\n+---------------------------+---------------+--------------+\n| MAX_ERROR_COUNT           | 128           | 64           |\n| SKIP_PARALLEL_REPLICATION | ON            | NULL         |\n| INNODB_SYNC_SPIN_LOOPS    | NULL          | 30           |\n+---------------------------+---------------+--------------+\n\nSetting the global values:\n\nSET GLOBAL max_error_count=256;\n\nSET GLOBAL skip_parallel_replication=ON;\nERROR 1228 (HY000): Variable \'skip_parallel_replication\' is a SESSION variable \n and can\'t be used with SET GLOBAL\n\nSET GLOBAL innodb_sync_spin_loops=120;\n\nSELECT VARIABLE_NAME, SESSION_VALUE, GLOBAL_VALUE FROM\n INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE \n VARIABLE_NAME IN (\'max_error_count\', \'skip_parallel_replication\',\n\'innodb_sync_spin_loops\');\n+---------------------------+---------------+--------------+\n| VARIABLE_NAME             | SESSION_VALUE | GLOBAL_VALUE |\n+---------------------------+---------------+--------------+\n| MAX_ERROR_COUNT           | 128           | 256          |\n| SKIP_PARALLEL_REPLICATION | ON            | NULL         |\n| INNODB_SYNC_SPIN_LOOPS    | NULL          | 120          |\n+---------------------------+---------------+--------------+\n\nSHOW VARIABLES will by default return the session value unless the variable is\nglobal only.\n\nSHOW VARIABLES LIKE \'max_error_count\';\n+-----------------+-------+\n| Variable_name   | Value |\n+-----------------+-------+\n| max_error_count | 128   |\n+-----------------+-------+\n\nSHOW VARIABLES LIKE \'skip_parallel_replication\';\n+---------------------------+-------+\n| Variable_name             | Value |\n+---------------------------+-------+\n| skip_parallel_replication | ON    |\n+---------------------------+-------+\n\nSHOW VARIABLES LIKE \'innodb_sync_spin_loops\';\n+------------------------+-------+\n| Variable_name          | Value |\n+------------------------+-------+\n| innodb_sync_spin_loops | 120   |\n+------------------------+-------+\n\nUsing the inplace syntax:\n\nSELECT (@a:=1);\n+---------+\n| (@a:=1) |\n+---------+\n|       1 |\n+---------+\n\nSELECT @a;\n+------+\n| @a   |\n+------+\n|    1 |\n+------+\n\nURL: https://mariadb.com/kb/en/set/','','https://mariadb.com/kb/en/set/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (347,26,'SET CHARACTER SET','Syntax\n------\n\nSET {CHARACTER SET | CHARSET}\n  {charset_name | DEFAULT}\n\nDescription\n-----------\n\nSets the character_set_client and character_set_results session system\nvariables to the specified character set and collation_connection to the value\nof collation_database, which implicitly sets character_set_connection to the\nvalue of character_set_database.\n\nThis maps all strings sent between the current client and the server with the\ngiven mapping.\n\nExample\n-------\n\nSHOW VARIABLES LIKE \'character_set\\_%\';\n+--------------------------+--------+\n| Variable_name            | Value  |\n+--------------------------+--------+\n| character_set_client     | utf8   |\n| character_set_connection | utf8   |\n| character_set_database   | latin1 |\n| character_set_filesystem | binary |\n| character_set_results    | utf8   |\n| character_set_server     | latin1 |\n| character_set_system     | utf8   |\n+--------------------------+--------+\n\nSHOW VARIABLES LIKE \'collation%\';\n+----------------------+-------------------+\n| Variable_name        | Value             |\n+----------------------+-------------------+\n| collation_connection | utf8_general_ci   |\n| collation_database   | latin1_swedish_ci |\n| collation_server     | latin1_swedish_ci |\n+----------------------+-------------------+\n\nSET CHARACTER SET utf8mb4;\n\nSHOW VARIABLES LIKE \'character_set\\_%\';\n+--------------------------+---------+\n| Variable_name            | Value   |\n+--------------------------+---------+\n| character_set_client     | utf8mb4 |\n| character_set_connection | latin1  |\n| character_set_database   | latin1  |\n| character_set_filesystem | binary  |\n| character_set_results    | utf8mb4 |\n| character_set_server     | latin1  |\n| character_set_system     | utf8    |\n+--------------------------+---------+\n\nSHOW VARIABLES LIKE \'collation%\';\n+----------------------+-------------------+\n| Variable_name        | Value             |\n+----------------------+-------------------+\n| collation_connection | latin1_swedish_ci |\n| collation_database   | latin1_swedish_ci |\n| collation_server     | latin1_swedish_ci |\n+----------------------+-------------------+\n\nURL: https://mariadb.com/kb/en/set-character-set/','','https://mariadb.com/kb/en/set-character-set/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (348,26,'SET NAMES','Syntax\n------\n\nSET NAMES {\'charset_name\'\n  [COLLATE \'collation_name\'] | DEFAULT}\n\nDescription\n-----------\n\nSets the character_set_client, character_set_connection, character_set_results\nand, implicitly, the collation_connection session system variables to the\nspecified character set and collation.\n\nThis determines which character set the client will use to send statements to\nthe server, and the server will use for sending results back to the client.\n\nucs2, utf16, and utf32 are not valid character sets for SET NAMES, as they\ncannot be used as client character sets.\n\nThe collation clause is optional. If not defined (or if DEFAULT is specified),\nthe default collation for the character set will be used.\n\nQuotes are optional for the character set or collation clauses.\n\nExamples\n--------\n\nSELECT VARIABLE_NAME, SESSION_VALUE \n FROM INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE\n VARIABLE_NAME LIKE \'character_set_c%\' OR\n VARIABLE_NAME LIKE \'character_set_re%\' OR\n VARIABLE_NAME LIKE \'collation_c%\';\n+--------------------------+-----------------+\n| VARIABLE_NAME            | SESSION_VALUE   |\n+--------------------------+-----------------+\n| CHARACTER_SET_RESULTS    | utf8            |\n| CHARACTER_SET_CONNECTION | utf8            |\n| CHARACTER_SET_CLIENT     | utf8            |\n| COLLATION_CONNECTION     | utf8_general_ci |\n+--------------------------+-----------------+\n\nSET NAMES big5;\n\nSELECT VARIABLE_NAME, SESSION_VALUE \n FROM INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE\n VARIABLE_NAME LIKE \'character_set_c%\' OR\n VARIABLE_NAME LIKE \'character_set_re%\' OR\n VARIABLE_NAME LIKE \'collation_c%\';\n+--------------------------+-----------------+\n| VARIABLE_NAME            | SESSION_VALUE   |\n+--------------------------+-----------------+\n| CHARACTER_SET_RESULTS    | big5            |\n| CHARACTER_SET_CONNECTION | big5            |\n| CHARACTER_SET_CLIENT     | big5            |\n| COLLATION_CONNECTION     | big5_chinese_ci |\n+--------------------------+-----------------+\n\nSET NAMES \'latin1\' COLLATE \'latin1_bin\';\n\nSELECT VARIABLE_NAME, SESSION_VALUE \n FROM INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE\n VARIABLE_NAME LIKE \'character_set_c%\' OR\n VARIABLE_NAME LIKE \'character_set_re%\' OR\n VARIABLE_NAME LIKE \'collation_c%\';\n+--------------------------+---------------+\n| VARIABLE_NAME            | SESSION_VALUE |\n+--------------------------+---------------+\n| CHARACTER_SET_RESULTS    | latin1        |\n| CHARACTER_SET_CONNECTION | latin1        |\n| CHARACTER_SET_CLIENT     | latin1        |\n| COLLATION_CONNECTION     | latin1_bin    |\n+--------------------------+---------------+\n\nSET NAMES DEFAULT;\n\nSELECT VARIABLE_NAME, SESSION_VALUE \n FROM INFORMATION_SCHEMA.SYSTEM_VARIABLES WHERE\n VARIABLE_NAME LIKE \'character_set_c%\' OR\n VARIABLE_NAME LIKE \'character_set_re%\' OR\n VARIABLE_NAME LIKE \'collation_c%\';\n+--------------------------+-------------------+\n| VARIABLE_NAME            | SESSION_VALUE     |\n+--------------------------+-------------------+\n| CHARACTER_SET_RESULTS    | latin1            |\n| CHARACTER_SET_CONNECTION | latin1            |\n| CHARACTER_SET_CLIENT     | latin1            |\n| COLLATION_CONNECTION     | latin1_swedish_ci |\n+--------------------------+-------------------+\n\nURL: https://mariadb.com/kb/en/set-names/','','https://mariadb.com/kb/en/set-names/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (349,26,'SET SQL_LOG_BIN','Syntax\n------\n\nSET [SESSION] sql_log_bin = {0|1}\n\nDescription\n-----------\n\nSets the sql_log_bin system variable, which disables or enables binary logging\nfor the current connection, if the client has the SUPER privilege. The\nstatement is refused with an error if the client does not have that privilege.\n\nBefore MariaDB 5.5 and before MySQL 5.6 one could also set sql_log_bin as a\nglobal variable. This was disabled as this was too dangerous as it could\ndamage replication.\n\nURL: https://mariadb.com/kb/en/set-sql_log_bin/','','https://mariadb.com/kb/en/set-sql_log_bin/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (350,26,'SET STATEMENT','MariaDB starting with 10.1.2\n----------------------------\nPer-query variables were introduced in MariaDB 10.1.2\n\nSET STATEMENT can be used to set the value of a system variable for the\nduration of the statement. It is also possible to set multiple variables.\n\nSyntax\n------\n\nSET STATEMENT var1=value1 [, var2=value2, ...] \n FOR <statement>\n\nwhere varN is a system variable (list of allowed variables is provided below),\nand valueN is a constant literal.\n\nDescription\n-----------\n\nSET STATEMENT var1=value1 FOR stmt\n\nis roughly equivalent to\n\nSET @save_value=@@var1;\nSET SESSION var1=value1;\nstmt;\nSET SESSION var1=@save_value;\n\nThe server parses the whole statement before executing it, so any variables\nset in this fashion that affect the parser may not have the expected effect.\nExamples include the charset variables, sql_mode=ansi_quotes, etc.\n\nExamples\n--------\n\nOne can limit statement execution time max_statement_time:\n\nSET STATEMENT max_statement_time=1000 FOR SELECT ... ;\n\nOne can switch on/off individual optimizations:\n\nSET STATEMENT optimizer_switch=\'materialization=off\' FOR SELECT ....;\n\nIt is possible to enable MRR/BKA for a query:\n\nSET STATEMENT  join_cache_level=6, optimizer_switch=\'mrr=on\'  FOR SELECT ...\n\nNote that it makes no sense to try to set a session variable inside a SET\nSTATEMENT:\n\n#USELESS STATEMENT\nSET STATEMENT sort_buffer_size = 100000 for SET SESSION sort_buffer_size =\n200000;\n\nFor the above, after setting sort_buffer_size to 200000 it will be reset to\nits original state (the state before the SET STATEMENT started) after the\nstatement execution.\n\nLimitations\n-----------\n\nThere are a number of variables that cannot be set on per-query basis. These\ninclude:\n\n* autocommit\n* character_set_client\n* character_set_connection\n* character_set_filesystem\n* collation_connection\n* default_master_connection\n* debug_sync\n* interactive_timeout\n* gtid_domain_id\n* last_insert_id\n* log_slow_filter\n* log_slow_rate_limit\n* log_slow_verbosity\n* long_query_time\n* min_examined_row_limit\n* profiling\n* profiling_history_size\n* query_cache_type\n* rand_seed1\n* rand_seed2\n* skip_replication\n* slow_query_log\n* sql_log_off\n* tx_isolation\n* wait_timeout\n\nSource\n------\n\n* The feature was originally implemented as a Google Summer of Code 2009\nproject by Joseph Lukas. \n* Percona Server 5.6 included it as Per-query variable statement\n* MariaDB ported the patch and fixed many bugs. The task in MariaDB Jira is\nMDEV-5231.\n\nURL: https://mariadb.com/kb/en/set-statement/','','https://mariadb.com/kb/en/set-statement/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (351,26,'SET Variable','Syntax\n------\n\nSET var_name = expr [, var_name = expr] ...\n\nDescription\n-----------\n\nThe SET statement in stored programs is an extended version of the general SET\nstatement. Referenced variables may be ones declared inside a stored program,\nglobal system variables, or user-defined variables.\n\nThe SET statement in stored programs is implemented as part of the\npre-existing SET syntax. This allows an extended syntax of SET a=x, b=y, ...\nwhere different variable types (locally declared variables, global and session\nserver variables, user-defined variables) can be mixed. This also allows\ncombinations of local variables and some options that make sense only for\nsystem variables; in that case, the options are recognized but ignored.\n\nSET can be used with both local variables and user-defined variables.\n\nWhen setting several variables using the columns returned by a query, SELECT\nINTO should be preferred.\n\nTo set many variables to the same value, the LAST_VALUE( ) function can be\nused.\n\nBelow is an example of how a user-defined variable may be set:\n\nSET @x = 1;\n\nURL: https://mariadb.com/kb/en/set-variable/','','https://mariadb.com/kb/en/set-variable/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (352,26,'About SHOW','SHOW has many forms that provide information about databases, tables, columns,\nor status information about the server. These include:\n\n* SHOW AUTHORS\n* SHOW CHARACTER SET [like_or_where]\n* SHOW COLLATION [like_or_where]\n* SHOW [FULL] COLUMNS FROM tbl_name [FROM db_name] [like_or_where]\n* SHOW CONTRIBUTORS\n* SHOW CREATE DATABASE db_name\n* SHOW CREATE EVENT event_name\n* SHOW CREATE PACKAGE package_name\n* SHOW CREATE PACKAGE BODY package_name\n* SHOW CREATE PROCEDURE proc_name\n* SHOW CREATE TABLE tbl_name\n* SHOW CREATE TRIGGER trigger_name\n* SHOW CREATE VIEW view_name\n* SHOW DATABASES [like_or_where]\n* SHOW ENGINE engine_name {STATUS | MUTEX}\n* SHOW [STORAGE] ENGINES\n* SHOW ERRORS [LIMIT [offset,] row_count]\n* SHOW [FULL] EVENTS\n* SHOW FUNCTION CODE func_name\n* SHOW FUNCTION STATUS [like_or_where]\n* SHOW GRANTS FOR user\n* SHOW INDEX FROM tbl_name [FROM db_name]\n* SHOW INNODB STATUS\n* SHOW OPEN TABLES [FROM db_name] [like_or_where]\n* SHOW PLUGINS\n* SHOW PROCEDURE CODE proc_name\n* SHOW PROCEDURE STATUS [like_or_where]\n* SHOW PRIVILEGES\n* SHOW [FULL] PROCESSLIST\n* SHOW PROFILE [types] [FOR QUERY n] [OFFSET n] [LIMIT n]\n* SHOW PROFILES\n* SHOW [GLOBAL | SESSION] STATUS [like_or_where]\n* SHOW TABLE STATUS [FROM db_name] [like_or_where]\n* SHOW TABLES [FROM db_name] [like_or_where]\n* SHOW TRIGGERS [FROM db_name] [like_or_where]\n* SHOW [GLOBAL | SESSION] VARIABLES [like_or_where]\n* SHOW WARNINGS [LIMIT [offset,] row_count]\n\nlike_or_where:\n  LIKE \'pattern\'\n | WHERE expr\n\nIf the syntax for a given SHOW statement includes a LIKE \'pattern\' part,\n\'pattern\' is a string that can contain the SQL \"%\" and \"_\" wildcard\ncharacters. The pattern is useful for restricting statement output to matching\nvalues.\n\nSeveral SHOW statements also accept a WHERE clause that provides more\nflexibility in specifying which rows to display. See Extended Show.\n\nURL: https://mariadb.com/kb/en/about-show/','','https://mariadb.com/kb/en/about-show/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (353,26,'Extended Show','The following SHOW statements can be extended by using a WHERE clause and a\nLIKE clause to refine the results:\n\n* SHOW CHARACTER SET\n* SHOW COLLATION\n* SHOW COLUMNS\n* SHOW DATABASES\n* SHOW FUNCTION STATUS\n* SHOW INDEX\n* SHOW OPEN TABLES\n* SHOW PACKAGE STATUS\n* SHOW PACKAGE BODY STATUS\n* SHOW INDEX\n* SHOW PROCEDURE STATUS\n* SHOW STATUS\n* SHOW TABLE STATUS\n* SHOW TABLES\n* SHOW TRIGGERS\n* SHOW VARIABLES\n\nAs with a regular SELECT, the WHERE clause can be used for the specific\ncolumns returned, and the LIKE clause with the regular wildcards.\n\nExamples\n--------\n\nSHOW TABLES;\n+----------------------+\n| Tables_in_test       |\n+----------------------+\n| animal_count         |\n| animals              |\n| are_the_mooses_loose |\n| aria_test2           |\n| t1                   |\n| view1                |\n+----------------------+\n\nShowing the tables beginning with a only.\n\nSHOW TABLES WHERE Tables_in_test LIKE \'a%\';\n+----------------------+\n| Tables_in_test       |\n+----------------------+\n| animal_count         |\n| animals              |\n| are_the_mooses_loose |\n| aria_test2           |\n+----------------------+\n\nVariables whose name starts with aria and with a valued of greater than 8192:\n\nSHOW VARIABLES WHERE Variable_name LIKE \'aria%\' AND Value >8192;\n+------------------------------+---------------------+\n| Variable_name                | Value               |\n+------------------------------+---------------------+\n| aria_checkpoint_log_activity | 1048576             |\n| aria_log_file_size           | 1073741824          |\n| aria_max_sort_file_size      | 9223372036853727232 |\n| aria_pagecache_buffer_size   | 134217728           |\n| aria_sort_buffer_size        | 134217728           |\n+------------------------------+---------------------+\n\nShortcut, just returning variables whose name begins with aria.\n\nSHOW VARIABLES LIKE \'aria%\';\n+------------------------------------------+---------------------+\n| Variable_name                            | Value               |\n+------------------------------------------+---------------------+\n| aria_block_size                          | 8192                |\n| aria_checkpoint_interval                 | 30                  |\n| aria_checkpoint_log_activity             | 1048576             |\n| aria_force_start_after_recovery_failures | 0                   |\n| aria_group_commit                        | none                |\n| aria_group_commit_interval               | 0                   |\n| aria_log_file_size                       | 1073741824          |\n| aria_log_purge_type                      | immediate           |\n| aria_max_sort_file_size                  | 9223372036853727232 |\n| aria_page_checksum                       | ON                  |\n| aria_pagecache_age_threshold             | 300                 |\n| aria_pagecache_buffer_size               | 134217728           |\n| aria_pagecache_division_limit            | 100                 |\n| aria_recover                             | NORMAL              |\n| aria_repair_threads                      | 1                   |\n| aria_sort_buffer_size                    | 134217728           |\n| aria_stats_method                        | nulls_unequal       |\n| aria_sync_log_dir                        | NEWFILE             |\n| aria_used_for_temp_tables                | ON                  |\n+------------------------------------------+---------------------+\n\nURL: https://mariadb.com/kb/en/extended-show/','','https://mariadb.com/kb/en/extended-show/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (354,26,'SHOW AUTHORS','Syntax\n------\n\nSHOW AUTHORS\n\nDescription\n-----------\n\nThe SHOW AUTHORS statement displays information about the people who work on\nMariaDB. For each author, it displays Name, Location, and Comment values. All\ncolumns are encoded as latin1.\n\nThese include:\n\n* First the active people in MariaDB are listed.\n* Then the active people in MySQL.\n* Last the people that have contributed to MariaDB/MySQL in the past.\n\nThe order is somewhat related to importance of the contribution given to the\nMariaDB project, but this is not 100% accurate. There is still room for\nimprovement and debate...\n\nExample\n-------\n\nSHOW AUTHORS\\G\n*************************** 1. row ***************************\n  Name: Michael (Monty) Widenius\nLocation: Tusby, Finland\n Comment: Lead developer and main author\n*************************** 2. row ***************************\n  Name: Sergei Golubchik\nLocation: Kerpen, Germany\n Comment: Architect, Full-text search, precision math, plugin framework,\nmerges etc\n*************************** 3. row ***************************\n  Name: Igor Babaev\nLocation: Bellevue, USA\n Comment: Optimizer, keycache, core work\n*************************** 4. row ***************************\n  Name: Sergey Petrunia\nLocation: St. Petersburg, Russia\n Comment: Optimizer\n*************************** 5. row ***************************\n  Name: Oleksandr Byelkin\nLocation: Lugansk, Ukraine\n Comment: Query Cache (4.0), Subqueries (4.1), Views (5.0)\n*************************** 6. row ***************************\n  Name: Timour Katchaounov\nLocation: Sofia , Bulgaria\n Comment: Optimizer\n*************************** 7. row ***************************\n  Name: Kristian Nielsen\nLocation: Copenhagen, Denmark\n Comment: Replication, Async client prototocol, General buildbot stuff\n*************************** 8. row ***************************\n  Name: Alexander (Bar) Barkov\nLocation: Izhevsk, Russia\n Comment: Unicode and character sets\n*************************** 9. row ***************************\n  Name: Alexey Botchkov (Holyfoot)\nLocation: Izhevsk, Russia\n Comment: GIS extensions, embedded server, precision math\n*************************** 10. row ***************************\n  Name: Daniel Bartholomew\nLocation: Raleigh, USA\n Comment: MariaDB documentation, Buildbot, releases\n*************************** 11. row ***************************\n  Name: Colin Charles\nLocation: Selangor, Malesia\n Comment: MariaDB documentation, talks at a LOT of conferences\n*************************** 12. row ***************************\n  Name: Sergey Vojtovich\nLocation: Izhevsk, Russia\n Comment: initial implementation of plugin architecture, maintained native\nstorage engines (MyISAM, MEMORY, ARCHIVE, etc), rewrite of table cache\n*************************** 13. row ***************************\n  Name: Vladislav Vaintroub\nLocation: Mannheim, Germany\n Comment: MariaDB Java connector, new thread pool, Windows optimizations\n*************************** 14. row ***************************\n  Name: Elena Stepanova\nLocation: Sankt Petersburg, Russia\n Comment: QA, test cases\n*************************** 15. row ***************************\n  Name: Georg Richter\nLocation: Heidelberg, Germany\n Comment: New LGPL C connector, PHP connector\n*************************** 16. row ***************************\n  Name: Jan Lindström\nLocation: Ylämylly, Finland\n Comment: Working on InnoDB\n*************************** 17. row ***************************\n  Name: Lixun Peng\nLocation: Hangzhou, China\n Comment: Multi Source replication\n*************************** 18. row ***************************\n  Name: Olivier Bertrand\nLocation: Paris, France\n Comment: CONNECT storage engine\n*************************** 19. row ***************************\n  Name: Kentoku Shiba\nLocation: Tokyo, Japan\n Comment: Spider storage engine, metadata_lock_info Information schema\n*************************** 20. row ***************************\n  Name: Percona\nLocation: CA, USA\n Comment: XtraDB, microslow patches, extensions to slow log\n*************************** 21. row ***************************\n  Name: Vicentiu Ciorbaru\nLocation: Bucharest, Romania\n Comment: Roles\n*************************** 22. row ***************************\n  Name: Sudheera Palihakkara\nLocation: \n Comment: PCRE Regular Expressions\n*************************** 23. row ***************************\n  Name: Pavel Ivanov\nLocation: USA\n Comment: Some patches and bug fixes\n*************************** 24. row ***************************\n  Name: Konstantin Osipov\nLocation: Moscow, Russia\n Comment: Prepared statements (4.1), Cursors (5.0), GET_LOCK (10.0)\n*************************** 25. row ***************************\n  Name: Ian Gilfillan\nLocation: South Africa\n Comment: MariaDB documentation\n*************************** 26. row ***************************\n  Name: Federico Razolli\nLocation: Italy\n Comment: MariaDB documentation Italian translation\n*************************** 27. row ***************************\n  Name: Guilhem Bichot\nLocation: Bordeaux, France\n Comment: Replication (since 4.0)\n*************************** 28. row ***************************\n  Name: Andrei Elkin\nLocation: Espoo, Finland\n Comment: Replication\n*************************** 29. row ***************************\n  Name: Dmitri Lenev\nLocation: Moscow, Russia\n Comment: Time zones support (4.1), Triggers (5.0)\n*************************** 30. row ***************************\n  Name: Marc Alff\nLocation: Denver, CO, USA','','https://mariadb.com/kb/en/show-authors/');
update help_topic set description = CONCAT(description, '\n Comment: Signal, Resignal, Performance schema\n*************************** 31. row ***************************\n  Name: Mikael Ronström\nLocation: Stockholm, Sweden\n Comment: NDB Cluster, Partitioning, online alter table\n*************************** 32. row ***************************\n  Name: Ingo Strüwing\nLocation: Berlin, Germany\n Comment: Bug fixing in MyISAM, Merge tables etc\n*************************** 33. row ***************************\n  Name: Marko Mäkelä\nLocation: Helsinki, Finland\n Comment: InnoDB core developer\n...\n\nURL: https://mariadb.com/kb/en/show-authors/') WHERE help_topic_id = 354;
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (355,26,'SHOW BINARY LOGS','Syntax\n------\n\nSHOW BINARY LOGS\nSHOW MASTER LOGS\n\nDescription\n-----------\n\nLists the binary log files on the server. This statement is used as part of\nthe procedure described in PURGE BINARY LOGS, that shows how to determine\nwhich logs can be purged.\n\nThis statement requires the SUPER privilege, the REPLICATION_CLIENT privilege,\nor, from MariaDB 10.5.2, the BINLOG MONITOR privilege.\n\nExamples\n--------\n\nSHOW BINARY LOGS;\n+--------------------+-----------+\n| Log_name           | File_size |\n+--------------------+-----------+\n| mariadb-bin.000001 |     19039 |\n| mariadb-bin.000002 |    717389 |\n| mariadb-bin.000003 |       300 |\n| mariadb-bin.000004 |       333 |\n| mariadb-bin.000005 |       899 |\n| mariadb-bin.000006 |       125 |\n| mariadb-bin.000007 |     18907 |\n| mariadb-bin.000008 |     19530 |\n| mariadb-bin.000009 |       151 |\n| mariadb-bin.000010 |       151 |\n| mariadb-bin.000011 |       125 |\n| mariadb-bin.000012 |       151 |\n| mariadb-bin.000013 |       151 |\n| mariadb-bin.000014 |       125 |\n| mariadb-bin.000015 |       151 |\n| mariadb-bin.000016 |       314 |\n+--------------------+-----------+\n\nURL: https://mariadb.com/kb/en/show-binary-logs/','','https://mariadb.com/kb/en/show-binary-logs/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (356,26,'SHOW BINLOG EVENTS','Syntax\n------\n\nSHOW BINLOG EVENTS\n [IN \'log_name\'] [FROM pos] [LIMIT [offset,] row_count]\n\nDescription\n-----------\n\nShows the events in the binary log. If you do not specify \'log_name\', the\nfirst binary log is displayed.\n\nRequires the BINLOG MONITOR privilege (>= MariaDB 10.5.2) or the REPLICATION\nSLAVE privilege (<= MariaDB 10.5.1).\n\nExample\n-------\n\nSHOW BINLOG EVENTS IN \'mysql_sandbox10019-bin.000002\';\n+-------------------------------+-----+-------------------+-----------+--------\n----+------------------------------------------------+\n| Log_name                      | Pos | Event_type        | Server_id |\nEnd_log_pos | Info                                           |\n+-------------------------------+-----+-------------------+-----------+--------\n----+------------------------------------------------+\n| mysql_sandbox10019-bin.000002 |   4 | Format_desc       |         1 |       \n 248 | Server ver: 10.0.19-MariaDB-log, Binlog ver: 4 |\n| mysql_sandbox10019-bin.000002 | 248 | Gtid_list         |         1 |       \n 273 | []                                             |\n| mysql_sandbox10019-bin.000002 | 273 | Binlog_checkpoint |         1 |       \n 325 | mysql_sandbox10019-bin.000002                  |\n| mysql_sandbox10019-bin.000002 | 325 | Gtid              |         1 |       \n 363 | GTID 0-1-1                                     |\n| mysql_sandbox10019-bin.000002 | 363 | Query             |         1 |       \n 446 | CREATE DATABASE blog                           |\n| mysql_sandbox10019-bin.000002 | 446 | Gtid              |         1 |       \n 484 | GTID 0-1-2                                     |\n| mysql_sandbox10019-bin.000002 | 484 | Query             |         1 |       \n 571 | use `blog`; CREATE TABLE bb (id INT)           |\n+-------------------------------+-----+-------------------+-----------+--------\n----+------------------------------------------------+\n\nURL: https://mariadb.com/kb/en/show-binlog-events/','','https://mariadb.com/kb/en/show-binlog-events/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (357,26,'SHOW CHARACTER SET','Syntax\n------\n\nSHOW CHARACTER SET\n  [LIKE \'pattern\' | WHERE expr]\n\nDescription\n-----------\n\nThe SHOW CHARACTER SET statement shows all available character sets. The LIKE\nclause, if present on its own, indicates which character set names to match.\nThe WHERE and LIKE clauses can be given to select rows using more general\nconditions, as discussed in Extended SHOW.\n\nThe same information can be queried from the Information Schema CHARACTER_SETS\ntable.\n\nSee Setting Character Sets and Collations for details on specifying the\ncharacter set at the server, database, table and column levels.\n\nExamples\n--------\n\nSHOW CHARACTER SET LIKE \'latin%\';\n+---------+-----------------------------+-------------------+--------+\n| Charset | Description                 | Default collation | Maxlen |\n+---------+-----------------------------+-------------------+--------+\n| latin1  | cp1252 West European        | latin1_swedish_ci |      1 |\n| latin2  | ISO 8859-2 Central European | latin2_general_ci |      1 |\n| latin5  | ISO 8859-9 Turkish          | latin5_turkish_ci |      1 |\n| latin7  | ISO 8859-13 Baltic          | latin7_general_ci |      1 |\n+---------+-----------------------------+-------------------+--------+\n\nSHOW CHARACTER SET WHERE Maxlen LIKE \'2\';\n+---------+---------------------------+-------------------+--------+\n| Charset | Description               | Default collation | Maxlen |\n+---------+---------------------------+-------------------+--------+\n| big5    | Big5 Traditional Chinese  | big5_chinese_ci   |      2 |\n| sjis    | Shift-JIS Japanese        | sjis_japanese_ci  |      2 |\n| euckr   | EUC-KR Korean             | euckr_korean_ci   |      2 |\n| gb2312  | GB2312 Simplified Chinese | gb2312_chinese_ci |      2 |\n| gbk     | GBK Simplified Chinese    | gbk_chinese_ci    |      2 |\n| ucs2    | UCS-2 Unicode             | ucs2_general_ci   |      2 |\n| cp932   | SJIS for Windows Japanese | cp932_japanese_ci |      2 |\n+---------+---------------------------+-------------------+--------+\n\nURL: https://mariadb.com/kb/en/show-character-set/','','https://mariadb.com/kb/en/show-character-set/');
insert into help_topic (help_topic_id,help_category_id,name,description,example,url) values (358,26,'SHOW CLIENT_STATISTICS','Syntax\n------\n\nSHOW CLIENT_STATISTICS\n\nDescription\n-----------\n\nThe SHOW CLIENT_STATISTICS statement is part of the User Statistics feature.\nIt was removed as a separate statement in MariaDB 10.1.1, but effectively\nreplaced by the generic SHOW information_schema_table statement. The\ninformation_schema.CLIENT_STATISTICS table holds statistics about client\nconnections.\n\nThe userstat system variable must be set to 1 to activate this feature. See\nthe User Statistics and information_schema.CLIENT_STATISTICS articles for more\ninformation.\n\nExample\n-------\n\nSHOW CLIENT_STATISTICS\\G\n*************************** 1. row ***************************\n        Client: localhost\n  Total_connections: 35\nConcurrent_connections: 0\n    Connected_time: 708\n      Busy_time: 2.5557979999999985\n       Cpu_time: 0.04123740000000002\n    Bytes_received: 3883\n      Bytes_sent: 21595\n Binlog_bytes_written: 0\n      Rows_read: 18\n      Rows_sent: 115\n     Rows_deleted: 0\n    Rows_inserted: 0\n     Rows_updated: 0\n   Select_commands: 70\n   Update_commands: 0\n    Other_commands: 0\n Commit_transactions: 1\n Rollback_transactions: 0\n  Denied_connections: 0\n   Lost_connections: 0\n    Access_denied: 0\n    Empty_queries: 35\n\nURL: https://mariadb.com/kb/en/show-client-statistics/','','https://mariadb.com/kb/en/show-client-statistics/');
