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https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
You can have up to 255 ENUM and SET columns in one table. In MIN(), MAX(), and other aggregate functions, MySQL currently compares ENUM and SET columns by their string value rather than by the string's relative position in the set. This section ...
https://dev.mysql.com/doc/refman/8.0/en/grant-tables.html
Table 8.7 procs_priv Table Columns Table Name procs_priv Scope columns Host Db User Routine_name Routine_type Privilege columns Proc_priv Other columns Timestamp Grantor The Routine_type column is an ENUM column with values of 'FUNCTION' or ... The ...
https://dev.mysql.com/doc/refman/8.0/en/compressed-format.html
If a column has only a small set of possible values, the data type is converted to ENUM. Compressed storage format is a read-only format that is generated with the myisampack tool. Compressed tables have the following characteristics: Compressed ...
https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
You can also explicitly assign 0 to the column to generate sequence numbers, unless the NO_AUTO_VALUE_ON_ZERO SQL mode is enabled. For example: INSERT INTO animals (id,name) VALUES(0,'groundhog'); If the column is declared NOT NULL, it is also ...
https://dev.mysql.com/doc/refman/8.0/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statement-performance-analyzer.html
Parameters in_action ENUM('snapshot', 'overall', 'delta', 'create_tmp', 'create_table', 'save', 'cleanup'): The action to take. Creates a report of the statements running on the server. The views are calculated based on the overall and/or delta ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-thread-instrumented.html
Returns YES or NO to indicate whether Performance Schema instrumentation for a given connection ID is enabled, UNKNOWN if the ID is unknown, or NULL if the ID is NULL. This is a value of the type given in the PROCESSLIST_ID column of the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-instrument-default-timed.html
Returns YES or NO to indicate whether a given Performance Schema instrument is timed by default. Example mysql> SELECT sys.ps_is_instrument_default_timed('memory/innodb/row_log_buf'); ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-instrument-default-enabled.html
Returns YES or NO to indicate whether a given Performance Schema instrument is enabled by default. Example mysql> SELECT sys.ps_is_instrument_default_enabled('memory/innodb/row_log_buf'); ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-consumer-enabled.html
Returns YES or NO to indicate whether a given Performance Schema consumer is enabled, or NULL if the argument is NULL. If the argument is not a valid consumer name, an error occurs. (Prior to MySQL 8.0.18, the function returns NULL if the argument ...