sql面試 查找每個班級的前5名學生（取分類數據的前幾條數據）

 

關鍵字PARTITION BY

自己看代碼嘍~

SELECT 
       *
FROM
(
    SELECT ROW_NUMBER() OVER (PARTITION BY ClassType ORDER BY Score DESC) rowid,
           ClassType,
           Name,
           Score
    FROM dbo.CAMAIN
) TT
WHERE TT.rowid <= 5;