Sql server SQL Server 2008 R2:通过删除特定表来更改视图

我有以下三个表，并为所有三个表创建了视图

表格：

s1

CREATE TABLE s1
(
 Cola INT,
 Colb VARCHAR(10)
);

表格：

s2

CREATE TABLE s2
(
 Cola INT,
 Colb VARCHAR(10)
);

表格：

s3

CREATE TABLE s3
(
 Cola INT,
 Colb VARCHAR(10)
);

插入：

INSERT INTO s1 VALUES(1,'a');
INSERT INTO s1 VALUES(1,'b');

INSERT INTO s2 VALUES(3,'c');
INSERT INTO s2 VALUES(4,'d');

INSERT INTO s3 VALUES(1,'a');
INSERT INTO s3 VALUES(1,'b');

-------------
cola    colb
-------------
1       a
1       b
3       c
4       d
1       a
1       b

创建视图：

sx

CREATE VIEW sx as
SELECT * FROM s1
UNION ALL 
SELECT * FROM s2
UNION ALL
SELECT * FROM s3;

现在我有这个：

SELECT * FROM Sx;

结果：

INSERT INTO s1 VALUES(1,'a');
INSERT INTO s1 VALUES(1,'b');

INSERT INTO s2 VALUES(3,'c');
INSERT INTO s2 VALUES(4,'d');

INSERT INTO s3 VALUES(1,'a');
INSERT INTO s3 VALUES(1,'b');

-------------
cola    colb
-------------
1       a
1       b
3       c
4       d
1       a
1       b

注意：我想

改变视图

，在视图中我想删除那些

cola

包含值

1

的表。根据我的说法，表

s1

和

s3

都有这些值

注1：如果所有表都包含值

1

，则

视图

必须是

删除

---

问题：如何通过检查上述特定条件来更改视图？

您可以使用替代触发器：

Create Trigger SX_Del On Sx Instead of delete
As 
Begin
    Delete s From s1 s Inner Join deleted d on d.Cola = s.Cola
    Delete From s2 Where cola in (Select Cola From deleted )
    Delete From s3 Where cola in (Select Cola From deleted )
End

---

就像视图中的每个不同选择一样，您必须为每个表定义必须删除的内容。

您可以使用替代触发器：

Create Trigger SX_Del On Sx Instead of delete
As 
Begin
    Delete s From s1 s Inner Join deleted d on d.Cola = s.Cola
    Delete From s2 Where cola in (Select Cola From deleted )
    Delete From s3 Where cola in (Select Cola From deleted )
End

就像视图中的每个不同选择一样，您必须为每个表定义必须删除的内容