##1，首先将每门的最高分和最低分查出来，叫做max_min
##2,将所有考的每门的最高和最低分查出来，叫做max_min_id
##3，然后将student表和exam表内联。
##4，过滤的条件是，学生的id没在刚刚查出来的表max_min_id里
##5，最后排序。
with max_min as (
    select exam_id , max(score) from exam group by exam_id
    union
    select exam_id, min(score) from exam group by exam_id),
max_min_id as (
    select Student_id from exam where (exam_id,score ) in (
        select * from max_min )
        )
select distinct e.Student_id,s.Student_name from 
Student s  join exam e on s.Student_id=e.Student_id
where e.Student_id not in (
    select * from max_min_id )
order by e.student_id