Question

我想实现删除3个相关表中的行的过程。

我有桌子，A，B和C.

Table A
ID

Table B
ID
tableAId

Table C
ID
tablceBId

关系表A - B是一对多，关系B - C是一对多。

现在我想实现一个删除与表A相关的所有行的过程。我不想在级联上删除这些行。我可以在一个查询中实现这一点吗？

我在表A中传递了行ID。

Answer 1

CREATE PROCEDURE delTableA
@tableA_ID int
AS
BEGIN
    DELETE C
    FROM C
    INNER JOIN B ON C.ID = B.tableCId
    INNER JOIN A ON B.ID = A.tableBId
    WHERE A.ID = @tableA_ID

    DELETE B
    FROM B
    INNER JOIN A ON B.ID = A.tableBId 
    WHERE A.ID = @tableA_ID

    DELETE FROM A
    WHERE A.ID = @tableA_ID
END
GO

如同，

CREATE TABLE C (ID int)
CREATE TABLE B (ID int, tableCId int)
CREATE TABLE A (ID int, tableBId int)
GO
INSERT INTO c VALUES (1)
INSERT INTO b VALUES (1, 1)
INSERT INTO a VALUES (1, 1) 
GO

CREATE PROCEDURE delTableA
@tableA_ID int
AS
BEGIN
    DELETE C
    FROM C
    INNER JOIN B ON C.ID = B.tableCId
    INNER JOIN A ON B.ID = A.tableBId
    WHERE A.ID = @tableA_ID

    DELETE B
    FROM B
    INNER JOIN A ON B.ID = A.tableBId 
    WHERE A.ID = @tableA_ID

    DELETE FROM A
    WHERE A.ID = @tableA_ID
END
GO
EXEC delTableA 1
GO

如果您运行此查询，则全部为空：

select * from A
select * from B
select * from C

删除相关行的过程

1 个答案: