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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-processlist-table.html
row *************************** ID: 5 USER: event_scheduler HOST: localhost DB: NULL COMMAND: Daemon TIME: 137 STATE: Waiting on empty queue INFO: NULL *************************** 2. row *************************** ID: 9 USER: me HOST: ... Note The ...
https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those characteristics that all operands have: a data type, a length, an indication that it can be ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-relation-functions-mbr.html
MBRCoveredBy() handles its arguments as follows: If either argument is NULL or an empty geometry, the return value is NULL. MBRCovers() handles its arguments as follows: If either argument is NULL or an empty geometry, the return value is NULL.
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/mysql-cluster-programs-ndb-import.html
--output-type=name Command-Line Format --output-type=name Type Enumeration Default Value ndb Valid Values null Set the output type. ndb_import imports CSV-formatted data, such as that produced by mysqldump --tab, directly into NDB using the NDB API. ndb_import requires a connection to an NDB management server (ndb_mgmd) to function; it does not require a connection to a MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/column-count-limit.html
mysql> CREATE TABLE t2 (c1 VARCHAR(65533) NOT NULL) ENGINE = InnoDB CHARACTER SET latin1; Query OK, 0 rows affected (0.01 sec) For MyISAM tables, NULL columns require additional space in the row to record whether their values are NULL. Each NULL ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-secondary-indexes.html
row *************************** id: 1 select_type: SIMPLE table: jemp partitions: NULL type: range possible_keys: i key: i key_len: 5 ref: NULL rows: 2 filtered: 100.00 Extra: Using where 1 row in set, 1 warning (0.00 sec) mysql> SHOW WARNINGS\G ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-porting-mysql.html
Consider these aspects of memcached applications when adapting an existing MySQL schema or application to use the daemon_memcached plugin: memcached keys cannot contain spaces or newlines, because these characters are used as separators in the ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-functions-general-purpose.html
If the key cannot be created, the return value is NULL and an error occurs. mysql> SELECT @x; +------+ | @x | +------+ | NULL | +------+ mysql> SELECT keyring_key_generate('x', 'AES', 16) INTO @x; mysql> SELECT @x; +------+ | @x | +------+ | 1 | ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html
When the primary key is extended with an additional column or columns, any columns added must be defined as NOT NULL, and no values in any such columns may be changed during the time that the backup is being taken. Beginning with NDB 7.6.19, ... New ...