如何使用SQL Server区分多个列？

Question

SELECT DISTINCT 
    MRP.[date], FT.feedtype, ROUND(MRP.rateperkg, 3) AS Rateperkg 
FROM 
    K_FS_FeedMrpDetails MRP 
INNER join 
    K_FPS_feedtype FT ON FT.sno = MRP.feedtype 
WHERE
    MRP.[date] BETWEEN '2013-08-09 00:00:00.000' AND '2014-08-25 00:00:00.000' 
    AND  MRP.state = 1  
    AND MRP.rateperkg != 0
GROUP BY 
    ft.feedtype,mrp.rateperkg 
ORDER BY
    MRP.[date] desc

在我的查询中有相同的列值feedtype和rateperkg ..

Answer 1

您不需要一起使用distinct与group。当您在选择SQL Server中使用distinct时，将distinct应用于选择查询的所有列。