Question

我有一个选择查询，如下所示：

 select cola,colb,colc,cold,cole,colf,colg,colh,coli,colj,colk
 from test
 where cola in (select colb from test);

如何从不同的列中仅获得不同的cola和colb？

我的尝试：

 select Distinct cola,colb,colc,cold,cole,colf,colg,colh,coli,colj,colk
 from test
 where cola in (select distinct colb from test);

Answer 1

您可以将ROW_NUMBER与CTE：

一起使用

WITH CTE AS
(
 select cola,colb,colc,cold,cole,colf,colg,colh,coli,colj,colk,
        rn = ROW_NUMBER() OVER (PARTITION BY cola, colb ORDER BY cola)
 from test
 where cola in (select colb from test)
)
SELECT  cola,colb,colc,cold,cole,colf,colg,colh,coli,colj,colk
FROM CTE
WHERE rn = 1

这为每个可乐，colb组合选择任意行。如果您想微调它，请将ORDER BY cola更改为更有意义的内容。

使用SQL Server 2008 R2对两列不同

1 个答案: