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https://dev.mysql.com/doc/refman/5.7/en/gis-general-property-functions.html
ST_GeometryType(g) Returns a binary string indicating the name of the geometry type of which the geometry instance g is a member, or NULL if the argument is NULL. ST_Dimension(g) Returns the inherent dimension of the geometry value g, or NULL if the ... The functions listed in this section do not restrict their argument and accept a geometry value of any ...
https://dev.mysql.com/doc/refman/5.7/en/index-statistics.html
For a join based on the <=> comparison operator, NULL is not treated differently from any other value: NULL <=> NULL, just as N <=> N for any other N. However, for a join based on the = operator, NULL is different from non-NULL values: expr1 = expr2 ... Storage engines collect statistics about tables for use by the ...
https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html
For example: mysql> SELECT DAYOFMONTH('2001-11-00'), MONTH('2005-00-00'); -> 0, 0 Other functions expect complete dates and return NULL for incomplete dates. For example: mysql> SELECT DATE_ADD('2006-05-00',INTERVAL 1 DAY); -> NULL mysql> SELECT ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-gtids.html
gtid_executed System Variable gtid_executed Scope Global Dynamic No Type String Unit set of GTIDs When used with global scope, this variable contains a representation of the set of all transactions executed on the server and GTIDs that have been set ... The MySQL Server system variables described in this section are used to monitor and control Global Transaction Identifiers ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/type-conversion.html
For example, MySQL automatically converts strings to numbers as necessary, and vice versa. mysql> SELECT 1+'1'; -> 2 mysql> SELECT CONCAT(2,' test'); -> '2 test' It is also possible to convert a number to a string explicitly using the CAST() ...
https://dev.mysql.com/doc/refman/5.7/en/reset-master.html
The value of the gtid_purged system variable is set to an empty string (''), the global value (but not the session value) of the gtid_executed system variable is set to an empty string, and the mysql.gtid_executed table is cleared (see ... RESET ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-ndb-transid-mysql-connection-map-table.html
The ndb_transid_mysql_connection_map table provides a mapping between NDB transactions, NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information is used when populating the server_operations and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples.html
Identifying Blocking Transactions It is sometimes helpful to identify which transaction blocks another. The tables that contain information about InnoDB transactions and data locks enable you to determine which transaction is waiting for another, ...