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
        from
            user_profile
    ) as up
where
    rn = 1
order by
    university

row_number() over (partition by university order by gpa):partition by用于分组的列，order by 用于排序的列

select
    device_id,
    university,
    gpa
from
    user_profile
where
    (university, gpa) in (
        select
            university,
            min(gpa)
        from
            user_profile
        group by
            university
    )
order by
    university