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https://dev.mysql.com/doc/refman/5.7/en/pattern-matching.html
MySQL provides standard SQL pattern matching as well as a form of pattern matching based on extended regular expressions similar to those used by Unix utilities such as vi, grep, and sed. SQL pattern matching enables you to use _ to match any ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl-operations.html
ALGORITHM=INPLACE is not permitted under certain conditions if columns have to be converted to NOT NULL. For a PRIMARY KEY index, MySQL also checks that none of the PRIMARY KEY columns contains a NULL. When you add a primary key using the ... Online ...
https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html
There are multiple ways to cause MySQL to accept the query: Alter the table to make name a primary key or a unique NOT NULL column. (This technique is inapplicable if NULL must be permitted as a valid name value.) Use ANY_VALUE() to refer to ...The ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-pruning.html
Important Invalid DATE and DATETIME values referenced in the WHERE condition of a statement against a partitioned table are treated as NULL. The core concept behind partition pruning is relatively simple, and can be described as “Do not scan ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-performance-analyzer.html
If in_table is NULL and no snapshot exists, a new snapshot is created. Creates a report of the statements running on the server. The views are calculated based on the overall and/or delta activity. This procedure disables binary logging during its ...
https://dev.mysql.com/doc/refman/5.7/en/data-masking-functions.html
Return value: The masked string, or NULL if either margin is negative. Return value: The masked string, or NULL if either margin is negative. Return value: The masked Social Security number as a string, or NULL if the argument is not the correct ...
https://dev.mysql.com/doc/refman/5.7/en/gis-wkb-functions.html
The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the ... These functions take as arguments a BLOB containing a Well-Known Binary (WKB) representation and, optionally, a spatial reference system identifier ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-online-add-node-example.html
In this section we provide a detailed example illustrating how to add new NDB Cluster data nodes online, starting with an NDB Cluster having 2 data nodes in a single node group and concluding with a cluster having 4 data nodes in 2 node groups.
https://dev.mysql.com/doc/refman/5.7/en/alter-table.html
Running ALTER TABLE tbl_name ENGINE=INNODB on an existing InnoDB table performs a “null” ALTER TABLE operation, which can be used to defragment an InnoDB table, as described in Section 14.12.4, “Defragmenting a Table”. If the old default is ... ALTER TABLE tbl_name [alter_option [, alter_option] ...] [partition_options] alter_option: { table_options | ADD [COLUMN] col_name column_definition [FIRST | AFTER col_name] | ADD [COLUMN] (col_name column_definition,...) | ADD {INDEX | KEY} [index_name] [index_type] (key_part,...) [index_option] ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-row-format.html
An SQL NULL value reserves one or two bytes in the record directory. An SQL NULL value reserves zero bytes in the data part of the record if stored in a variable-length column. Reserving fixed space for NULL values permits columns to be updated in ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...