Question

Account            Positive_Amount         Negative_Amount
------------       ..............         ...................
10101               5000
10012               6000
10101                                     -2000
10012                                     -9000
10101               2000
10012               7000
10101                                     -1000
10012                                     -1500

结果必须像

call

Answer 1

这并不复杂，只需使用此查询即可。希望对您有所帮助：

--first add your new column--
ALTER TABLE Accounts
 ADD Negative_Amount decimal(10,2) NULL

--update your columns--
UPDATE Accounts
SET Negative_Amount = CASE WHEN Amount<0 THEN Negative_Amount ELSE NULL END
,Amount = CASE WHEN Amount>=0 THEN Negative_Amount ELSE NULL END

--this sp helps you to rename objects--
EXEC SP_RENAME 'Accounts.Amount' , 'Positive_Amount', 'COLUMN'

这是在您希望表中进行结构更改的情况下。如果您只想要结果，其他答案就是解决方案。

Answer 2

使用CASE子句非常简单：

SELECT Account,
       CASE WHEN Amount >= 0 THEN Amount ELSE NULL END AS Positive_Amount,
       CASE WHEN Amount < 0 THEN Amount ELSE NULL END AS Negative_Amount
FROM YourTable;

Answer 3

一个简单的CASE就可以做到。

SELECT account, 
      (CASE WHEN Amount >= 0 THEN Amount ELSE Null END) AS Positive_Amount,
      (CASE WHEN Amount <  0 THEN Amount ELSE Null END) AS Negative_Amount
FROM tbl;

如何将正值和负值从单列分隔到不同列

3 个答案: