如何修改此查询以返回D列

Question

SELECT   ColA, MAX(CONVERT(varchar(15),ColB) + ' ' + CONVERT(varchar(15),ColC))
FROM     dbo.TableX
GROUPBY  ColA

Answer 1

SELECT 
    ColA, MAX(CONVERT(varchar(15),ColB) + ' ' + CONVERT(varchar(15),ColC)), 
    ColD 
FROM 
    dbo.TableX 
GROUP BY 
    ColA, ColD

Answer 2

RE：您的评论“这会导致返回具有非唯一ColA的行。”

关注your previous question我觉得你需要像

这样的东西

;WITH X AS
(
SELECT   ColA, 
         ColD,
         RANK() OVER (PARTITION BY ColA ORDER BY CONVERT(varchar(15),ColB) + ' ' + CONVERT(varchar(15),ColC) DESC) Rnk
FROM     dbo.TableX
)
SELECT ColA, ColD, Rnk
FROM X
WHERE Rnk = 1;