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https://dev.mysql.com/doc/refman/5.7/en/sql-compound-statements.html
END compound statement and other statements that can be used in the body of stored programs: Stored procedures and functions, triggers, and events. These objects are defined in terms of SQL code that is stored on the server for later invocation (see ...
https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
A subquery can contain many of the keywords or clauses that an ordinary SELECT can contain: DISTINCT, GROUP BY, ORDER BY, LIMIT, joins, index hints, UNION constructs, comments, functions, and so on. All subquery forms and operations that the SQL ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. For example, this limitation applies to statements of the following forms: DELETE FROM t WHERE ... FROM t ...); Exception: The preceding prohibition does not apply ...
https://dev.mysql.com/doc/refman/5.7/en/sys-diagnostics.html
statement_truncate_len, @sys.statement_truncate_len The maximum length of statements returned by the format_statement() function. Creates a report of the current server status for diagnostic purposes. This procedure disables binary logging during ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-save.html
To prevent other simultaneous calls to save the configuration, ps_setup_save() acquires an advisory lock named sys.ps_setup_save by calling the GET_LOCK() function. This enables you to alter the configuration temporarily for debugging or other ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-show-enabled.html
Displays all currently enabled Performance Schema configuration. Parameters in_show_instruments BOOLEAN: Whether to display enabled instruments. This might be a long list. in_show_threads BOOLEAN: Whether to display enabled threads. Example mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-object-overview.html
object_type The object type: BASE TABLE, INDEX (index_type), EVENT, FUNCTION, PROCEDURE, TRIGGER, VIEW. This view summarizes the types of objects within each schema. Note For MySQL instances with a large number of objects, this view might take a ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-reference.html
The sys schema includes tables and triggers, views, and stored procedures and functions.
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
Stored functions that query Performance Schema configuration and provide formatting services. MySQL 5.7 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. sys schema objects ...
https://dev.mysql.com/doc/refman/5.7/en/sys-version.html
For example, use the VERSION() function to retrieve the MySQL server version. This view provides the current sys schema and MySQL server versions. Note As of MySQL 5.7.28, this view is deprecated and subject to removal in a future MySQL version.