MySQL：当儿童行删除时删除父母

Question

比方说，我有一个父表：FAMILY_MEMBER，每个父表有一个unique ID id。

我也有mother_id，father_id和daughter_id，每个指向一个FAMILY_MEMBER排FAMILY表。

当我删除FAMILY行时，我希望数据库自动删除父行的3 FAMILY_MEMBER。这似乎与ON DELETE和ON UPDATE条款打算做的完全相反。

Answer 1

create trigger t1 
    after delete on FAMILY 
     for each row 
      BEGIN 
      delete from family_member 
       where id = old.mother_id; 
      delete from family_member 
       where id = old.fa=ther_id; 
      delete from family_member 
       where id = old.daughter_id; 
      END 

或者这一个（你可以用分隔符触发器和表名）：

create trigger `t1` 
    after delete on `FAMILY` 
     for each row 
      BEGIN 
      delete from family_member 
       where id = old.mother_id; 
      delete from family_member 
       where id = old.fa=ther_id; 
      delete from family_member 
       where id = old.daughter_id; 
      END