题解 | #找出每个学校GPA最低的同学#

select 
    device_id,
    university,
    gpa
from(
    select
        *,
        row_number() over(partition by university order by gpa) as rn 
        #按照学校聚合后，将学校学生成绩升序排列保证rn=1对应的是最低分
    from
        user_profile
) as tbl
where rn=1
order by university;