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学生—课程”数据库中包含学生表、课程表、课表课表java http 源码学生选课表3个表
您好，源码源码spring 源码研究这样：
--1
select Sname,网站iapp源码群Sage from Student where Sage<(select Sage from Student where Sno='某一学生') and Sdept='数学系'
--2
select Sname from Student where Sno in (select Sno from SC)
--3
select Sname from Student where Sno in (select Sno from SC group by Sno having count(*)=(select count(*) from Course ))
--4
题意不清楚。
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