Trigger Metadata +------+ | 1 | | 3 | | 1 | | 7 | | 1 | | 8 | | 4 | | 4 | +------+ +------+ | a2 | +------+ | 1 | | 3 | | 1 | | 7 | | 1 | | 8 | | 4 | | 4 | +------+ +----+------+ | a4 | b4 | +----+------+ | 1 | 3 | | 2 | 0 | | 3 | 1 | | 4 | 2 | | 5 | 0 | | 6 | 0 | | 7 | 1 | | 8 | 1 | | 9 | 0 | | 10 | 0 | +----+------+ 8 rows in set (0.00 sec) 8 rows in set (0.00 sec) 5 rows in set (0.00 sec) 10 rows in set (0.00 sec) mysql>  SELECT * FROM test2; mysql>  SELECT * FROM test3; +----+ | a3 | +----+ | 2 | | 5 | | 6 | | 9 | | 10 | +----+ mysql>  SELECT * FROM test4; •Query the  TRIGGERS  table of the  INFORMATION_SCHEMA  database. See Section 26.3.45, “The INFORMATION_SCHEMA TRIGGERS Table” . •Use the  SHOW CREATE TRIGGER  statement. See Section 13.7.7.11, “SHOW CREATE TRIGGER Statement” . To obtain metadata about triggers: 4736 25.3.2 Trigger Metadata