从相同行中删除一行

Question

我有一个带有（第一，第二）列的表T.我有两行，第一个= 1，第二个= 2。我想删除其中的一行。我怎么做？

Answer 1

;WITH CTE AS 
(
SELECT TOP 1 * 
FROM YourTable 
WHERE first=1 and second=2 
) 
DELETE FROM CTE; 

或者，如果SQL Server 2000的

DELETE T 
FROM (
    SELECT TOP 1 * 
    FROM YourTable 
    WHERE [first]=1 and [second]=2 
) T; 

然后添加一个主键。

Answer 2

您可以使用ROW_NUMBER（）。

DECLARE @T as Table(First int , Second int) 

INsert Into @T 
Values (1,2), 
(1,2) 

SELECT * FROM @T 

;WITH CTE as 
(SELECT ROW_NUMBER() over (order by first,second) rn , * from @T) 

DELETE FROM CTE where rn = 1 

select * from @T 

如果你改变RN包括由

ROW_NUMBER() over (PARTITION BY first, second order by first,second)

分区，改变在哪里是WHERE RN <> 1

，你可以使用它作为一个通用的解决方案，以消除一是任何受骗者，秒