创建触发器
Create (definer=user/current_use) trigger *** before/after insert…/update…/delete… on *** for each row …;
不能将触发器与临时表或视图联系起来
同一个表不能勇于两个具有相同触发时刻和事件的触发期
单一触发器不能与多个事件或多个表关联
Show triggers (from/in ***) (like ‘***’/where…);
Create customers_insert_trigger after insert on mysl_test.customers for each row set @str=’one customer added!’;