level 2
找我呀582152734
2019年10月16日 14点10分
level 3
第二题:select s.sid,s.sname from student s
join sc on s.sid=sc.sid where exsits (select cid from course c where sid=01420…)
group by s.sid,s.sname
having count(sc.cid)=(select count(cid) from sc where sid=014000);
2019年10月18日 07点10分
4
join sc on s.sid=sc.sid where exsits (select cid from course c where sid=01420…)
group by s.sid,s.sname
having count(sc.cid)=(select count(cid) from sc where sid=014000);
level 1
level 1