第一题答案： select T_Stu_Profile.Class_id,T_Stu_Profile.Stu_name,T_Lession.Lession_des from T_Stu_Profile,T_Lession,T_Score where T_Stu_Profile.Stu_id=T_Score.Stu_id and T_Lession.Lession_id=T_Score.Lession_id and T_Score.Score is null 第三题答案： select T_Lession.Lession_des, (select top 1 [Score] as top1 from T_Score where Lession_id=T_Lession.Lession_id order by [Score] desc) as 第一名, (select top 1 [Score] as top1 from T_Score where score not in (select top 1 [Score] as top1 from T_Score where Lession_id=T_Lession.Lession_id order by [Score] desc) and Lession_id=T_Lession.Lession_id order by [Score] desc) as 第二名, (select top 1 [Score] as top1 from T_Score where score not in (select top 2 [Score] as top1 from T_Score where Lession_id=T_Lession.Lession_id order by [Score] desc) and Lession_id=T_Lession.Lession_id order by [Score] desc) as 第三名 from T_Lession 楼主，连题目都换成我的了，也不给点分啊.. ...
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