SQL Server 比较同一表的两行的值并得到不匹配的列名

Question

我需要比较同一个表的两行（ INSERTED和DELETED ）并比较值。 然后我需要获取不匹配的列。 在触发器里面。

到目前为止，我已经尝试过，但我不知道如何比较这两行并获取包含不同值的列名。

SELECT * 
FROM inserted i
INNER JOIN deleted d ON d.PurchasingDocItemNo = i.PurchasingDocItemNo 
                     AND d.PurchasingDocNo = i.PurchasingDocNo
                     AND d.ReferenceDocumentNo = i.ReferenceDocumentNo
                     AND d.ProductNo = i.ProductNo

Answer 1

将您的选择更改为：

SELECT
-- For each column you're checking.  Also account for ISNull if you need to
CASE WHEN I.Col1 = D.Col1 THEN 0 ELSE 1 END AS Col1Changed.......
FROM INSERTED I
INNER JOIN DELETED D on (I.<PK> = D.<PK>)