比如user和student 各有一个ID字段我想实现当删除user某一条字段,在student表中会根据被删掉的user ID,删除掉对应的数据,建了个触发器老是报错,代码如下create trigger ssss before delete on student for each ROWBEGIN delete from user where id=old.id;end;报错信息: 1235 - This version of MySQL doesn't yet support 'multiple triggers with the same action time and event for one table'是不是因为我的mysql版本低,只支持update和insert