做法:
select tblstudent.StuId,tblstudent.StuName from tblstudent where ( (select tblscore.Score from tblscore where tblstudent.StuId=tblscore.StuId and tblscore.CourseId='002') <(select tblscore.Score from tblscore where tblstudent.StuId=tblscore.StuId and tblscore.CourseId='001') )