50個查詢系列-第8個查詢：查詢課程編號“002”的成績比課程編號“001”課程低的所有同學的學號、姓名；

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')
)