--------------------------表結構--------------------------
student(StuId,StuName,StuAge,StuSex) 學生表
teacher(TId,Tname) 教師表
course(CId,Cname,C_TId) 課程表
sc(SId,S_CId,Score) 成績表
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問題二十五：查詢各科成績前三名的記錄(不考慮成績并列情況)
SELECT * FROM (SELECT s1.S_CId,s1.Score,COUNT(DISTINCT s2.Score) Rank FROM sc AS s1 INNER JOIN sc AS s2 ON s1.S_CId=s2.S_CId AND s1.Score<s2.Score GROUP BY s1.S_CId,s1.Score) score WHERE score.Rank>=1 AND score.Rank<=3 GROUP BY score.S_CId,score.Rank;
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標籤：MySQL