摘要: --1、查询“1001”课程比“1002”课程成绩高的所有学生的学号;select a.S# from (select S#,score from sc where C#=1001) a, (select S#,score from sc where C# = 1002) b where a.sco 阅读全文
posted @ 2019-07-19 16:07 叹叹 阅读(409) 评论(0) 推荐(0) 编辑