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https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
In its simplest form, a subquery is a scalar subquery that returns a single value. A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those ...
https://dev.mysql.com/doc/refman/5.7/en/show-procedure-status.html
row *************************** Db: test Name: sp1 Type: PROCEDURE Definer: testuser@localhost Modified: 2018-08-08 13:54:11 Created: 2018-08-08 13:54:11 Security_type: DEFINER Comment: character_set_client: utf8 collation_connection: ...It returns ... SHOW PROCEDURE STATUS [LIKE 'pattern' | WHERE expr] This statement is a MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. It may occur for temporary tables created outside stored functions ...
https://dev.mysql.com/doc/refman/5.7/en/truncate-table.html
Logically, TRUNCATE TABLE is similar to a DELETE statement that deletes all rows, or a sequence of DROP TABLE and CREATE TABLE statements. It differs from DELETE in the following ways: Truncate operations drop and re-create the table, which is much ...To achieve high performance, it bypasses the DML method of deleting ...
https://dev.mysql.com/doc/refman/5.7/en/view-check-option.html
The WITH CHECK OPTION clause can be given for an updatable view to prevent inserts to rows for which the WHERE clause in the select_statement is not true. It also prevents updates to rows for which the WHERE clause is true but the update would ...
https://dev.mysql.com/doc/refman/5.7/en/time-zone-support.html
Note Named time zones can be used only if the time zone information tables in the mysql database have been created and populated. The MySQL installation procedure creates the time zone tables, but does not load them. For example: mysql_tzinfo_to_sql ... This section describes the time zone settings maintained by MySQL, how to load the system tables required for named time support, how to stay current with time zone changes, and how to enable leap-second ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-issues.html
Note Every NDB table is implicitly partitioned by key when it is created. This section discusses known problems or issues when using replication with NDB Cluster. A loss of connection can occur either between the source cluster SQL node and the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-upgrade.html
When you upgrade servers that participate in a replication topology, you need to take into account each server's role in the topology and look out for issues specific to replication. Upgrade Procedure With Table Repair Or Rebuild Some upgrades may ...For general information and instructions for upgrading a MySQL Server instance, see Section 2.10, “Upgrading ...
https://dev.mysql.com/doc/refman/5.7/en/set.html
A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is created. Trailing spaces are automatically deleted from SET member values in the table definition ...SET column values that consist of multiple set members are specified with members separated by commas ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-optimization-with-exists.html
The optimizer chooses SQL compliance over speed, so it accounts for the possibility that outer_expr might be NULL: If outer_expr is NULL, to evaluate the following expression, it is necessary to execute the SELECT to determine whether it produces ...