sql - 如何在 MS SQL WHERE IN 中删除(选择多列)

Question

我有一张表，可以称之为“Cluster”，它与第二张表 Element 相关。

簇:

Id Group Ele1 Ele2 Ele3
1   1     1    2     3
2   1     4   NULL   9
3   2     5    8     7

元素

Id Name
1  'A'
2  'b'
3  'c'
4  'd'
5  'z'
6  'j'
7  't'
8  'r'
9  'e'

现在我必须删除一个集群

DELETE FROM Cluster
WHERE   Cluster.Group= 1

但在我从 Cluster 中删除行之前我需要从 Element 中删除所有相关的行

DELETE FROM Element
WHERE Id IN (SELECT Ele1 Ele2 Ele3 
             FROM Cluster 
             WHERE Cluster.Group= 1)

但是这个查询不起作用所以我想念什么？

Answer 1

尝试这个:

DELETE FROM Element
WHERE Id IN (SELECT Ele1
             FROM Cluster 
             WHERE Cluster.[Group] = 1
                   And Ele1 Is Not NULL

             Union 

             SELECT Ele2
             FROM Cluster 
             WHERE Cluster.[Group] = 1
                   And Ele2 Is Not NULL

             Union 

             SELECT Ele3 
             FROM Cluster 
             WHERE Cluster.[Group] = 1
                   And Ele3 Is Not NULL
)