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https://dev.mysql.com/doc/refman/5.7/en/dynamic-format.html
NULL columns require additional space in the row to record whether their values are NULL. Each NULL column takes one bit extra, rounded up to the nearest byte. Dynamic storage format is used if a MyISAM table contains any variable-length columns ...
https://dev.mysql.com/doc/refman/5.7/en/select-into.html
If the FIELDS ESCAPED BY character is empty, no characters are escaped and NULL is output as NULL, not \N. INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column and line terminators can be ...
https://dev.mysql.com/doc/refman/5.7/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/5.7/en/gis-geometrycollection-property-functions.html
If any argument is NULL or the geometry argument is an empty geometry, the return value is NULL. If the argument is NULL or an empty geometry, the return value is NULL. GeometryN() is deprecated; expect it to be removed in a future MySQL release.
https://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html
Information about table definitions is stored both in the .frm files, and in the InnoDB data dictionary. If you move .frm files around, or if the server crashes in the middle of a data dictionary operation, these sources of information can become ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-page-compression.html
InnoDB supports page-level compression for tables that reside in file-per-table tablespaces. Page compression is enabled by specifying the COMPRESSION attribute with CREATE TABLE or ALTER TABLE. Supported Platforms Page compression requires sparse ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-troubleshoot.html
Attempting to insert a NULL value into a NOT NULL column causes the INSERT to fail, which may only become evident after you reinitialize the daemon_memcached plugin to apply changes to the innodb_memcache.containers table. If cas_column and ...When ... This section describes issues that you may encounter when using the InnoDB memcached ...
https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-plugin-usage.html
row *************************** id: 1 pattern: SELECT ? pattern_database: NULL replacement: SELECT ? + 1 enabled: YES message: NULL pattern_digest: NULL normalized_pattern: NULL The rule specifies a pattern template indicating which SELECT ... To ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-filter-definitions.html
The following list describes the permitted predefined functions for function items: audit_log_exclude_accounts_is_null() Checks whether the audit_log_exclude_accounts system variable is NULL. For information about using JSON data in MySQL, see ...