学生表:student(sno,sname,sage,ssex)
成绩表:sc(sno,cno,score)
课程表:course(cno,cname,tno)
教师表:teacher(tno,tname)

SQL语句书写:四表连接查询
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4条回答 默认 最新
- Xomm 2021-05-13 10:46关注
select t.tname,a.*,s.sname from teacher t left join course c on t.tno=c.tno left join ( select cno ,avg(score) as avg_score ,max(score) as max_score from sc group by cno ) a on c.cno=a.cno left join sc on a.cno=sc.cno and a.max_score=sc.score left join student s on sc.sno=s.sno
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