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https://dev.mysql.com/doc/refman/8.4/en/replication-threads-monitor-main.html
row *************************** Id: 2 User: root Host: localhost:32931 db: NULL Command: Binlog Dump Time: 94 State: Has sent all binlog to slave; waiting for binlog to be updated Info: NULL Here, thread 2 is a Binlog Dump thread that services a ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/spatial-convenience-functions.html
Unless otherwise specified, functions in this section handle their geometry arguments as follows: If any argument is NULL, the return value is NULL. For example, this polygon is geometrically invalid: POLYGON((0 0, 0 0, 0 0, 0 0, 0 0)) ST_Validate() ... The functions in this section provide convenience operations on geometry ...
https://dev.mysql.com/doc/refman/8.4/en/spatial-geojson-functions.html
This section describes functions for converting between GeoJSON documents and spatial values. Feature and FeatureCollection objects are not supported, except that geometry objects are extracted from them. MySQL also supports a native JSON data type ...
https://dev.mysql.com/doc/refman/8.4/en/sys-sys-get-config.html
Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the table. If sys_get_config() returns the default value and that value is ...
https://dev.mysql.com/doc/refman/8.4/en/update.html
If you update a column that has been declared NOT NULL by setting to NULL, an error occurs if strict SQL mode is enabled; otherwise, the column is set to the implicit default value for the column data type and the warning count is incremented.
https://dev.mysql.com/doc/mysql-cluster-manager/8.4/en/mcm-get.html
row *************************** Name: HostName1 Value: NULL Process1: ndb_mgmd NodeId1: 49 Process2: ndbmtd NodeId2: 1 Level: Default Comment: *************************** 5. row *************************** Name: HostName2 Value: NULL Process1: ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-real-escape-string-quote.html
The result is placed in the to argument, followed by a terminating null byte. (In the worst case, each character may need to be encoded as using two bytes, and there must be room for the terminating null byte.) When mysql_real_escape_string_quote() ... unsigned long mysql_real_escape_string_quote(MYSQL *mysql, char *to, const char *from, unsigned long length, char quote) Description This function creates a legal SQL string for use in an SQL ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-real-escape-string.html
The result is placed in the to argument, followed by a terminating null byte. (In the worst case, each character may need to be encoded as using two bytes, and there must be room for the terminating null byte.) When mysql_real_escape_string() ...
https://dev.mysql.com/doc/extending-mysql/8.4/en/writing-audit-plugins.html
This section describes how to write a server-side audit plugin, using the example plugin found in the plugin/audit_null directory of MySQL source distributions. The audit_null.c and audit_null_variables.h source files in that directory implement an ...Note Other examples of plugins that use the audit plugin API are the query rewrite plugin (see The Rewriter Query Rewrite Plugin) and the Version Tokens plugin (see Version ...