【mysql经典题】2、查询"1"课程比"2"课程成绩低的学生的

select s.*, c1.cno, c1.score, c2.cno, c2.score
from student s
         join sc c1 on s.sno = c1.sno
         join sc c2 on s.sno = c2.sno
where c1.cno = 1
  and c2.cno = 2
  and c1.score < c2.score;

总结

• 套路跟第一个题一样哈。