sql-server-2008 - 如何在特定列上选择不同的

Question

我在表中有几列

Col1 , Col2 , Col3 , Col4

现在我想这样选择
SELECT DISTINCT (Col1, Col2, Col3), Col4
即仅根据这三个列获得不同的结果。

Answer 1

从评论到另一个答案:

Can I get like this Col1, Col2 , Col3 and (Col4 in delimiter form)

是的，您可以使用 for xml path .

select Col1, 
       Col2,  
       Col3, 
       (
        select ',' + T2.Col4
        from YourTable T2
        where T1.Col1 = T2.Col1 and
              T1.Col2 = T2.Col2 and
              T1.Col3 = T2.Col3
        for xml path(''), type
       ).value('substring((./text())[1], 2)', 'varchar(max)') as Col4
from YourTable as T1
group by T1.Col1, T1.Col2, T1.Col3

SQL Fiddle