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https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization-with-exists.html
Certain optimizations are applicable to comparisons that use the IN (or =ANY) operator to test subquery results. This section discusses these optimizations, particularly with regard to the challenges that NULL values present. The last part of the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-setup-show-disabled.html
Displays all currently disabled Performance Schema configuration. Parameters in_show_instruments BOOLEAN: Whether to display disabled instruments. This might be a long list. in_show_threads BOOLEAN: Whether to display disabled threads. Example ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-trace-statement-digest.html
Traces all Performance Schema instrumentation for a specific statement digest. If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
When an operator is used with operands of different types, type conversion occurs to make the operands compatible. For example, MySQL automatically converts strings to numbers as necessary, and vice versa. mysql> SELECT 1+'1'; -> 2 mysql> SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/account-names.html
MySQL account names consist of a user name and a host name, which enables creation of distinct accounts for users with the same user name who connect from different hosts. This section describes the syntax for account names, including special ...
https://dev.mysql.com/doc/refman/8.0/en/administrative-connection-interface.html
As mentioned in Connection Volume Management, to allow for the need to perform administrative operations even when max_connections connections are already established on the interfaces used for ordinary connections, the MySQL server permits a ...
https://dev.mysql.com/doc/refman/8.0/en/alter-event.html
ALTER [DEFINER = user] EVENT event_name [ON SCHEDULE schedule] [ON COMPLETION [NOT] PRESERVE] [RENAME TO new_event_name] [ENABLE | DISABLE | DISABLE ON SLAVE] [COMMENT 'string'] [DO event_body] The ALTER EVENT statement changes one or more of the ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-partition-operations.html
Partitioning-related clauses for ALTER TABLE can be used with partitioned tables for repartitioning, to add, drop, discard, import, merge, and split partitions, and to perform partitioning maintenance. Simply using a partition_options clause with ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table.html
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} ...
https://dev.mysql.com/doc/refman/8.0/en/alter-user.html
ALTER USER [IF EXISTS] user [auth_option] [, user [auth_option]] ... [REQUIRE {NONE | tls_option [[AND] tls_option] ...}] [WITH resource_option [resource_option] ...] [password_option | lock_option] ... It enables authentication, role, SSL/TLS, ...