题解 | 找出每个学校GPA最低的同学

with
    t1 as (
        select
            device_id,
            university,
            gpa,
            row_number() over (
                partition by
                    university
                order by
                    gpa asc
            ) as rk
        from
            user_profile
    )
select
    device_id,
    university,
    gpa
from
    t1
where
    rk = 1
order by
    university