MySQL 笔试题

表和表间关系图： 题目及答案：（未完，待续。。。） -- 1、课程1成绩大于课程2成绩的学生学号 select S,score from sc where c=1; select S,score from sc where c=2; select a.s from (select S,score from sc where c=1) a, (select S,score from sc whe

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