Student(S#,Sname)
Cource(C#,Cname)
SC(S#,C#,score)
Teacher(T#,Tname)
要求查询001课程比002课程成绩高的所有学生的学号，请教各位大虾如何写SQL语句？
------解决方案--------------------------------------------------------
select a.S#
from SC a ,SC b
where a.S#=b.S#
and a.C#='001'
and b.C#='002'
and a.score>b.score