20210 在 2024/12/8 8:48:38 说到:  
  查询没有选过课人数最多的那个系的没选课同学的平均年龄(当前年为2010)

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发言人:2021014946 发言时间:2024/12/9 10:10:35 求金币 select avg(2010-year(csrq)) from student where sno not in(select sno from sc) and sdept in(select sdept from student where sno not in (select sno from sc) group by sdept having count(*)>= all (select count(*) from student where sno not in (select sno from sc) group by sdept)) 27.
发言人:2021014999 发言时间:2024/12/8 8:50:50 student.sno=sc.sno and sc.cno=course.cno and

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