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https://dev.mysql.com/doc/refman/5.7/en/information-schema-tables-table.html
Not all storage engines update this time, in which case, the value is always NULL. For views, all TABLES columns are NULL except that TABLE_NAME indicates the view name and TABLE_COMMENT says VIEW. The TABLES table has these columns: TABLE_CATALOG ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-internals.html
The mapped key must be a non-Null CHAR or VARCHAR type. There is no length restriction and the value can be NULL. flags: Must be mapped to an INTEGER of at least 32-bits and can be NULL. If there are fewer delimited values than mapped columns, ...
https://dev.mysql.com/doc/refman/5.7/en/locking-functions.html
Returns 1 if the lock was obtained successfully, 0 if the attempt timed out (for example, because another client has previously locked the name), or NULL if an error occurred (such as running out of memory or the thread was killed with mysqladmin ...
https://dev.mysql.com/doc/refman/5.7/en/non-typed-operators.html
->> Return value from JSON column after evaluating path and unquoting the result; equivalent to JSON_UNQUOTE(JSON_EXTRACT()). / Division operator := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an ...
https://dev.mysql.com/doc/refman/5.7/en/obtaining-plugin-information.html
Any that have a PLUGIN_LIBRARY value of NULL are built in and cannot be unloaded. row *************************** PLUGIN_NAME: binlog PLUGIN_VERSION: 1.0 PLUGIN_STATUS: ACTIVE PLUGIN_TYPE: STORAGE ENGINE PLUGIN_TYPE_VERSION: 50158.0 PLUGIN_LIBRARY: ... There are several ways to determine which plugins are installed in the server: The Information Schema PLUGINS table contains a row for each loaded ...
https://dev.mysql.com/doc/refman/5.7/en/other-vendor-data-types.html
To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL. If you create ...
https://dev.mysql.com/doc/refman/5.7/en/outer-join-optimization.html
If there is a row in A that matches the WHERE clause, but there is no row in B that matches the ON condition, an extra B row is generated with all columns set to NULL. For a LEFT JOIN, if the WHERE condition is always false for the generated NULL ...
https://dev.mysql.com/doc/refman/5.7/en/show-plugins.html
row *************************** Name: binlog Status: ACTIVE Type: STORAGE ENGINE Library: NULL License: GPL *************************** 2. row *************************** Name: CSV Status: ACTIVE Type: STORAGE ENGINE Library: NULL License: GPL ...
https://dev.mysql.com/doc/refman/5.7/en/show-table-status.html
Not all storage engines update this time, in which case, the value is always NULL. For views, all columns displayed by SHOW TABLE STATUS are NULL except that Name indicates the view name and Comment says VIEW. SHOW TABLE STATUS [{FROM | IN} ...
https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html
While a NULL itself does not require any storage space, NDB reserves 4 bytes per row if the table definition contains any columns defined as NULL, up to 32 NULL columns. InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type ...