查詢score中選學多門課程的同學中分數為非最高分成績的記錄。

20、查詢score中選學多門課程的同學中分數為非最高分成績的記錄。

 

select * from score a where sno in (

select sno from score group by sno having count(1)>1)

and a.degree<(select max(degree) from score b where a.cno=b.cno  )