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https://dev.mysql.com/doc/refman/9.7/en/replace.html
REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ... | VALUES row_constructor_list } REPLACE [LOW_PRIORITY | DELAYED] ...
https://dev.mysql.com/doc/refman/9.7/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/9.7/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/9.7/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/9.7/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/9.7/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/9.7/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/refman/9.7/en/case.html
The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. This syntax cannot be used to test for equality with NULL because NULL = NULL is false. CASE case_value WHEN when_value THEN statement_list [WHEN ...
https://dev.mysql.com/doc/refman/9.7/en/change-replication-source-to.html
PRIVILEGE_CHECKS_USER = {NULL | 'account'} Names a user account that supplies a security context for the specified channel. NULL, which is the default, means no security context is used. When PRIVILEGE_CHECKS_USER is NULL (the default), the user ...
https://dev.mysql.com/doc/refman/9.7/en/date-and-time-type-syntax.html
Also, any TIMESTAMP not explicitly declared as NOT NULL permits NULL values. You can also set any TIMESTAMP column to the current date and time by assigning it a NULL value, unless it has been defined with the NULL attribute to permit NULL values.