sql经常使用面试题

--一、查询"1"课程比"2"课程成绩高的全部学生的学号； select d.S# from (select b.S#,b.score as b_score,c.score as c_score from (select S#,score from Sc WHERE C#=1) b inner join (select S#,score from Sc WHERE C#=2) c on b.S

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