假如我有三个表:A,B,C
A表里面有字段：ID，name
B表里面有字段：ID，Wage 字段ID是表A的外键。
表C里面有字段：ID ,name,Wage
当我要删除表A的一行数据时，必须要先删除表B里面对应ID的数据！但在删除之前要先把需要删除的个ID的A,B表中的数据插入到C表中，C表中的ID值等于A,B表被删除的ID值！！
例子：
A:1，牛
B:1,300
那么就应该是C:1，牛，300
然后A,B表ID=1的记录被删除！
百里面有人给我的答案：
create trigger trig_delete
on A表
for delete
as
begin
insert into c表
select A表.ID,A表.name,B表.Wage from A表 join B表
on A表.ID=B表.ID
where ID=(select ID from deleted);
delete B表
where ID=(select ID from deleted)
end
但是在执行过程中
select A表.ID,A表.name,B表.Wage from A表 join B表
on A表.ID=B表.ID
where ID=(select ID from deleted);
where中的ID不明确
改为： where A表.ID=(select ID from deleted);后可以创建了。
但是在删除A表中的ID=1的数据时还是提示与外键约束冲突！要先删除B表中的ID=1的
急啊，求高手解答！
------解决方案--------------------
建个级联删除就行了
------解决方案--------------------
我觉得可以用INSTEAD OF 代替 FOR
------解决方案--------------------
- SQL code
use CSDNgocreate table table_A(id int primary key, name nchar(10))create table table_B(id int constraint FK_test foreign key(id) references table_A(id), wage int)create table table_C(id int, name char(10), wage int)insert into table_Aselect 1, N'牛'insert into table_Bselect 1, 300--=====================create trigger trig_deleteon table_Ainstead of deleteasbegin insert into table_c select c.id, a.name, b.wage from table_A a inner join deleted c on a.id = c.id inner join table_B b on a.id = b.id delete B from table_B B inner join deleted A on B.id = A.id delete A from table_A A inner join deleted C on A.id = C.idend go--testdelete table_a