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https://dev.mysql.com/doc/refman/5.7/en/server-options.html
All partition-specific columns in the Information Schema PARTITIONS table display NULL. When you start the mysqld server, you can specify program options using any of the methods described in Section 4.2.2, “Specifying Program Options”. The ...
https://dev.mysql.com/doc/refman/5.7/en/join.html
If there is no matching row for the right table in the ON or USING part in a LEFT JOIN, a row with all columns set to NULL is used for the right table. SELECT left_tbl.* FROM { OJ left_tbl LEFT OUTER JOIN right_tbl ON left_tbl.id = right_tbl.id } ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-source.html
Attempting to set the value of either of these two variables to an integer greater than 65,535 or less than 0 causes its value to be set to 65,535 instead. Attempting to set the value of auto_increment_increment or auto_increment_offset to a ...
https://dev.mysql.com/doc/refman/5.7/en/locking-service.html
Namespace and lock names must be non-NULL, nonempty, and have a maximum length of 64 characters. A namespace or lock name specified as NULL, the empty string, or a string longer than 64 characters results in an ER_LOCKING_SERVICE_WRONG_NAME error.
https://dev.mysql.com/doc/refman/5.7/en/range-optimization.html
AND key_partN cmp constN; Here, const1, const2, … are constants, cmp is one of the =, <=>, or IS NULL comparison operators, and the conditions cover all index parts. For a BTREE index, an interval might be usable for conditions combined with AND, ... The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value ...
https://dev.mysql.com/doc/refman/5.7/en/show-columns.html
Collation The collation for nonbinary string columns, or NULL for other columns. The value is YES if NULL values can be stored in the column, NO if not. (A UNIQUE index permits multiple NULL values, but you can tell whether the column permits NULL ... SHOW [FULL] {COLUMNS | FIELDS} {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW COLUMNS displays information about the columns in a given ...
https://dev.mysql.com/doc/refman/5.7/en/replication-administration-skip.html
If replication stops due to an issue with an event in a replicated transaction, you can resume replication by skipping the failed transaction on the replica. Before skipping a transaction, ensure that the replication I/O thread is stopped as well ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-info.html
row *************************** id: 1 select_type: SIMPLE table: trb1 partitions: p0,p1,p2,p3 type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 10 Extra: Using filesort In this case, all four partitions are searched. This ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-disk-data-objects.html
An extra “NULL row” provides additional information about undo log files. NDB Cluster Disk Data storage is implemented using a number of Disk Data objects. These include the following: Tablespaces act as containers for other Disk Data objects.
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-exchange.html
Table nt contains no foreign key references, and no other table has any foreign keys that refer to nt. There are no rows in nt that lie outside the boundaries of the partition definition for p. This condition does not apply if the WITHOUT VALIDATION ...