说明: --含数据库 --1、查询"1"课程比"2"课程成绩高的所有学生的学号; 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#=c.S#) d where d.b_score>d.c_score --2、查
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