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https://dev.mysql.com/doc/refman/5.7/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/5.7/en/merge-storage-engine.html
The column of the underlying table and the MERGE table can be NULL. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be used as one. “Identical” means that all tables have ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html
Either function produces an error if its (non-null) argument cannot be parsed as a valid JSON document, and NULL if the argument is NULL. Each member of the second object for which there is no member having the same key in the first object, and ...
https://dev.mysql.com/doc/refman/5.7/en/limit-optimization.html
row *************************** id: 1 select_type: SIMPLE table: t partitions: NULL type: range possible_keys: i key: i key_len: 8 ref: NULL rows: 14 filtered: 100.00 Extra: Using index condition; Using filesort See also Section 8.9.2, “Switchable ... If you need only a specified number of rows from a result set, use a LIMIT clause in the query, rather than fetching the whole result set and throwing away the extra ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-list.html
Note In MySQL 5.7, it is possible to match against only a list of integers (and possibly NULL—see Section 22.2.7, “How MySQL Partitioning Handles NULL”) when partitioning by LIST. List partitioning in MySQL is similar to range partitioning in ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-worker-table.html
After STOP SLAVE, the THREAD_ID column becomes NULL, but the WORKER_ID value is preserved. If the replica is not multithreaded, this table shows the status of the applier thread. Otherwise, the replica uses multiple worker threads and a coordinator ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-functions-general-purpose.html
If the key cannot be created, the return value is NULL and an error occurs. mysql> SELECT @x; +------+ | @x | +------+ | NULL | +------+ mysql> SELECT keyring_key_generate('x', 'AES', 16) INTO @x; mysql> SELECT @x; +------+ | @x | +------+ | 1 | ...
https://dev.mysql.com/doc/refman/5.7/en/show-index.html
row *************************** Table: city Non_unique: 0 Key_name: PRIMARY Seq_in_index: 1 Column_name: ID Collation: A Cardinality: 4188 Sub_part: NULL Packed: NULL Null: Index_type: BTREE Comment: Index_comment: *************************** 2. row ... SHOW {INDEX | INDEXES | KEYS} {FROM | IN} tbl_name [{FROM | IN} db_name] [WHERE expr] SHOW INDEX returns table index ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html
When the primary key is extended with an additional column or columns, any columns added must be defined as NOT NULL, and no values in any such columns may be changed during the time that the backup is being taken. Beginning with NDB 7.6.19, ... New ...
https://dev.mysql.com/doc/refman/5.7/en/column-count-limit.html
mysql> CREATE TABLE t2 (c1 VARCHAR(65533) NOT NULL) ENGINE = InnoDB CHARACTER SET latin1; Query OK, 0 rows affected (0.01 sec) For MyISAM tables, NULL columns require additional space in the row to record whether their values are NULL. Each NULL ...