sql面试 查找每个班级的前5名学生（取分类数据的前几条数据）

关键字PARTITION BY

自己看代码喽~

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;