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https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations.html
However, the result must be an integer value or NULL (except in the case of [LINEAR] KEY partitioning, as discussed elsewhere in this chapter; see Section 22.2, “Partitioning Types”, for more information). A partitioning key may not be a ...
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-selection.html
MySQL 5.7 supports explicit selection of partitions and subpartitions that, when executing a statement, should be checked for rows matching a given WHERE condition. Partition selection is similar to partition pruning, in that only specific ...
https://dev.mysql.com/doc/refman/5.7/en/grant-tables.html
The value is non-NULL only for accounts that use MySQL built-in authentication methods (accounts that use an authentication plugin of mysql_native_password or sha256_password). The value is NULL for other accounts, such as those authenticated using ... The mysql system database includes several grant tables that contain information about user accounts and the privileges held by ...
https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html
Examples: For conversion of a “zero” date string to a date, CONVERT() and CAST() return NULL and produce a warning when the NO_ZERO_DATE SQL mode is enabled. Table 12.15 Cast Functions and Operators Name Description BINARY Cast a string to a ...
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/pattern-matching.html
MySQL provides standard SQL pattern matching as well as a form of pattern matching based on extended regular expressions similar to those used by Unix utilities such as vi, grep, and sed. SQL pattern matching enables you to use _ to match any ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-auto-increment-handling.html
An example follows, where c1 is an AUTO_INCREMENT column of table t1: INSERT INTO t1 (c1,c2) VALUES (1,'a'), (NULL,'b'), (5,'c'), (NULL,'d'); Another type of “mixed-mode insert” is INSERT ... To make this clear, consider an example that uses ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-columns-table.html
This is NULL if the column has an explicit default of NULL, or if the column definition includes no DEFAULT clause. 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 ...