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https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
This statement is mapped to an ALTER TABLE statement to drop the index. They have the same meaning as for the ALTER TABLE statement. For more information, see Section 15.1.9, “ALTER TABLE Statement” MySQL NDB Cluster supports online operations ...algorithm_option: ALGORITHM [=] {DEFAULT | INPLACE | COPY} lock_option: LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} DROP INDEX drops the index named index_name from the table ...
https://dev.mysql.com/doc/refman/8.0/en/any-in-some-subqueries.html
The expression is TRUE if table t2 contains (21,14,7) because there is a value 7 in t2 that is less than 10. The expression is FALSE if table t2 contains (20,10), or if table t2 is empty. The expression is unknown (that is, NULL) if table t2 ...When ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-filtering.html
Note For audit log filtering to work as described here, the audit log plugin and the accompanying audit tables and functions must be installed. If the plugin is installed without the accompanying audit tables and functions needed for rule-based ...
https://dev.mysql.com/doc/refman/8.0/en/charset-examples.html
Example 1: Table and Column Definition CREATE TABLE t1 ( c1 CHAR(10) CHARACTER SET latin1 COLLATE latin1_german1_ci ) DEFAULT CHARACTER SET latin2 COLLATE latin2_bin; Here we have a column with a latin1 character set and a latin1_german1_ci ... The ...
https://dev.mysql.com/doc/refman/8.0/en/correlated-subqueries.html
A correlated subquery is a subquery that contains a reference to a table that also appears in the outer query. For example: SELECT * FROM t1 WHERE column1 = ANY (SELECT column1 FROM t2 WHERE t2.column2 = t1.column2); Notice that the subquery ...So, ...
https://dev.mysql.com/doc/refman/8.0/en/handler-scope.html
However, SQLSTATE handlers take precedence over SQLEXCEPTION handlers, so if the table t is nonexistent, the DROP TABLE statement raises a condition that activates the SQLSTATE handler: mysql> CALL p1(); +--------------------------------+ | msg | ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-and-mysql-replication.html
For example, you can replicate modifications to an InnoDB table on the source to a MyISAM table on the replica. Cascading actions for InnoDB tables on the source are executed on the replica only if the tables sharing the foreign key relation use ...
https://dev.mysql.com/doc/refman/8.0/en/mysqldump-delimited-text.html
If you invoke mysqldump with the --tab=dir_name option, it uses dir_name as the output directory and dumps tables individually in that directory using two files for each table. For a table named t1, the files are named t1.sql and t1.txt. The .sql ...
https://dev.mysql.com/doc/refman/8.0/en/outer-join-optimization.html
MySQL implements an A LEFT JOIN B join_specification as follows: Table B is set to depend on table A and all tables on which A depends. Table A is set to depend on all tables (except B) that are used in the LEFT JOIN condition. The LEFT JOIN ...If ...
https://dev.mysql.com/doc/refman/8.0/en/range-optimization.html
The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value intervals. To update table index statistics for best estimates, use ANALYZE TABLE. In MySQL 8.0, index dive skipping ...The following sections describe conditions under which the optimizer uses range ...