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https://dev.mysql.com/doc/refman/5.7/en/locking-service.html
A namespace or lock name specified as NULL, the empty string, or a string longer than 64 characters results in an ER_LOCKING_SERVICE_WRONG_NAME error. lock_names: An array of null-terminated strings that provides the names of the locks to acquire.
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-exchange.html
Table nt contains no foreign key references, and no other table has any foreign keys that refer to nt. There are no rows in nt that lie outside the boundaries of the partition definition for p. This condition does not apply if the WITHOUT VALIDATION ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-examples.html
This section provides some examples that show precision math query results in MySQL. These examples demonstrate the principles described in Section 12.21.3, “Expression Handling”, and Section 12.21.4, “Rounding Behavior”. Consider the ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-reference.html
Return value: The password string for success (up to 766 bytes), or NULL and an error for failure. Return value: If the call succeeds, the return value is a binary JSON string containing an array of audit events, or a JSON null value if that was ...
https://dev.mysql.com/doc/refman/5.7/en/range-optimization.html
Additionally, for BTREE indexes, comparison of a key part with a constant value is a range condition when using the >, <, >=, <=, BETWEEN, !=, or <> operators, or LIKE comparisons if the argument to LIKE is a constant string that does not start with ... The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value ...
https://dev.mysql.com/doc/refman/5.7/en/show-columns.html
Collation The collation for nonbinary string columns, or NULL for other columns. The value is YES if NULL values can be stored in the column, NO if not. (A UNIQUE index permits multiple NULL values, but you can tell whether the column permits NULL ... SHOW [FULL] {COLUMNS | FIELDS} {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW COLUMNS displays information about the columns in a given ...
https://dev.mysql.com/doc/refman/5.7/en/flow-control-functions.html
mysql> SELECT IFNULL(1,0); -> 1 mysql> SELECT IFNULL(NULL,10); -> 10 mysql> SELECT IFNULL(1/0,10); -> 10 mysql> SELECT IFNULL(1/0,'yes'); -> 'yes' The default return type of IFNULL(expr1,expr2) is the more “general” of the two expressions, in ...
https://dev.mysql.com/doc/refman/5.7/en/join.html
If there is no matching row for the right table in the ON or USING part in a LEFT JOIN, a row with all columns set to NULL is used for the right table. SELECT left_tbl.* FROM { OJ left_tbl LEFT OUTER JOIN right_tbl ON left_tbl.id = right_tbl.id } ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-source.html
Attempting to set the value of either of these two variables to an integer greater than 65,535 or less than 0 causes its value to be set to 65,535 instead. Attempting to set the value of auto_increment_increment or auto_increment_offset to a ...
https://dev.mysql.com/doc/refman/5.7/en/memory-storage-engine.html
(This is an uncommon feature for implementations of hash indexes.) Columns that are indexed can contain NULL values. To replicate this effect to replicas, the first time that the source uses a given MEMORY table after startup, it logs an event that ... The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in ...