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https://dev.mysql.com/doc/refman/5.7/en/information-schema-events-table.html
If the event's timing is determined by an EVERY clause instead of an AT clause (that is, if the event is recurring), the value of this column is NULL. This is displayed as a DATETIME value, and is NULL if no start date and time are defined for the ... The EVENTS table provides information about Event Manager events, which are discussed in Section 23.4, “Using the Event ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-functions-general-purpose.html
Return value: Returns the key value as a string for success, NULL if the key does not exist, or NULL and an error for failure. Return value: Returns the key type as a string for success, NULL if the key does not exist, or NULL and an error for ...If ... MySQL Server supports a keyring service that enables internal server components and plugins to store sensitive information securely for later ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-current-table.html
DIGEST The statement digest MD5 value as a string of 32 hexadecimal characters, or NULL if the statements_digest consumer is no. END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning.html
See Section 24.3.16, “The INFORMATION_SCHEMA PARTITIONS Table”, for more information; for some examples of queries against this table, see Section 22.2.7, “How MySQL Partitioning Handles NULL”. Note As of MySQL 5.7.17, the generic ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 13.1.20, “CREATE TRIGGER Statement”, and Section 13.1.31, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-lifecycle.html
In addition, for a non-transactional update, if a disk write failure occurs while attempting to write to the binary log cache and a gap is therefore created in the binary log, the resulting incident log event is assigned a GTID. When you issue RESET ... The life cycle of a GTID consists of the following steps: A transaction is executed and committed on the replication source ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-porting-mysql.html
If there is a short numeric primary key column in an InnoDB table, use it as the unique lookup key for memcached by converting the integer to a string value. In any query that performs arithmetic using column values, use the CAST() function to ...
https://dev.mysql.com/doc/refman/5.7/en/creating-tables.html
You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare minimum, each animal's name. Because the name by itself is not very interesting, the table should contain other ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-import.html
Higher values reduce status printing exponentially up to some pre-defined limit ADDED: NDB 7.6.2 --ndb-connectstring=connection_string, -c connection_string Set connect string for connecting to ndb_mgmd. Overrides entries in NDB_CONNECTSTRING and ...