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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/libmysqld-example.html
* * You can use mysql_library_init(0, NULL, NULL), and it * initializes the server using groups = { * "server", "embedded", NULL * }. These two example programs should work without any changes on a Linux or FreeBSD system. For other operating ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-threads-table.html
row *************************** THREAD_ID: 1 NAME: thread/sql/main TYPE: BACKGROUND PROCESSLIST_ID: NULL PROCESSLIST_USER: NULL PROCESSLIST_HOST: NULL PROCESSLIST_DB: NULL PROCESSLIST_COMMAND: NULL PROCESSLIST_TIME: 80284 PROCESSLIST_STATE: NULL ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-natural-language.html
By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search for a string against a text collection. For each row in the table, MATCH() returns a relevance value; that is, a similarity measure ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-online-operations.html
This does not perform any defragmentation, which requires an OPTIMIZE TABLE or null ALTER TABLE statement. The columns must permit NULL values and not have any explicit default value other than NULL. row *************************** Table: t1 Create ... MySQL NDB Cluster 7.5 and 7.6 support online table schema changes using ALTER TABLE ...
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/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 12.2, “Loadable Function Reference”. ->> Return value ...
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/audit-log-legacy-filtering.html
The value for either variable can be NULL or a string containing one or more comma-separated account names, each in user_name@host_name format. By default, both variables are NULL, in which case, no account filtering is done and auditing occurs for ... Note This section describes legacy audit log filtering, which applies under either of these circumstances: Before MySQL 5.7.13, that is, prior to the introduction of rule-based audit log filtering described in Section 6.4.5.7, “Audit Log ...