sql 练习

有三个表：
学生表：student  字段:stuID,name,gender,scholarship

成绩表：grade    字段:graID,stuID,courceID,grade
课程表：cource    字段:courceID,courceName,credits
求：查询所有课程分数都在90分以上的学生的stuID,name

 

select stuID, name

from student

where stuID in

(

  select stuID from (

     select count(1) cnt, stuID

     from grade

     where gade > 90

     group by stuID

   ) where cnt =(select count(1) from course)

)

 

 

or

 

 

select * from student where stuid not in (select distinct stuid from grade where grade < 90)