SELECT S# as 学生ID ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#=’004’) AS 数据库 ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#=’001’) AS 企业管理 ,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#=’006’) AS 英语 ,COUNT(*) AS 有效课程数, AVG(t.score) AS 平均成绩 FROM SC AS t GROUP BY S# ORDER BY avg(t.score)
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