sys Schema Stored Functions Example mysql>  SELECT @@sql_mode; +----------------------------------------+ | @@sql_mode | +----------------------------------------+ | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES | +----------------------------------------+ mysql>  SET @@sql_mode = sys.list_add(@@sql_mode, ’NO_ENGINE_SUBSTITUTION’); mysql>  SELECT @@sql_mode; +---------------------------------------------------------------+ | @@sql_mode | +---------------------------------------------------------------+ | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | +---------------------------------------------------------------+ mysql>  SET @@sql_mode = sys.list_drop(@@sql_mode, ’ONLY_FULL_GROUP_BY’); mysql>  SELECT @@sql_mode; +--------------------------------------------+ | @@sql_mode | +--------------------------------------------+ | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | +--------------------------------------------+ Removes a value from a comma-separated list of values and returns the result. For more information, see the description of  list_add() 28.4.5.8 The list_drop() Function Parameters Return Value Parameters 28.4.5.9 The ps_is_account_enabled() Function Example Return Value mysql>  SELECT sys.ps_is_account_enabled(’localhost’, ’root’); +------------------------------------------------+ | sys.ps_is_account_enabled(’localhost’, ’root’) | +------------------------------------------------+ | YES | +------------------------------------------------+ 5206 An  ENUM(’YES’,’NO’)  value. • in_host VARCHAR(60) : The host name of the account to check. • in_user VARCHAR(32) : The user name of the account to check. Returns  YES  or  NO  to indicate whether Performance Schema instrumentation for a given account is enabled. A  TEXT  value. • in_list TEXT : The list to be modified. • in_drop_value TEXT : The value to drop from the list.