查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree

SELECT SC1.Cno,SC1.Sno,SC1.Degree
FROM Score SC1,Score SC2
WHERE SC1.Cno='3-105' AND
      SC2.Cno='3-245' AND
      SC1.Degree>SC2.Degree

我用了自身连接 但是结果不对 请指点 谢谢