【数据库】 不错的练习题

WITH temp -- 查出每一个系每个人的总分
AS(
SELECT StuId, dep.DepId, dep.DepName,StuName, (SELECT SUM(Score) FROM Score WHERE StuId=stu.StuId) sumScore FROM Stu
INNER JOIN Dep on Dep.DepId=stu.DepId
)

SELECT * FROM temp a
INNER JOIN (SELECT DepId, max(sumScore) maxScore FROM temp GROUP BY DepId) ms -- 以系分组取出每系最高分
ON ms.DepId=a.DepId AND ms.maxScore=a.sumScore -- 以系id和总分查出学员信息
ORDER BY a.DepId