题解 | #找出每个学校GPA最低的同学#
找出每个学校GPA最低的同学
http://www.nowcoder.com/practice/90778f5ab7d64d35a40dc1095ff79065
(select device_id,university,gpa,
row_number() over (partition by university order by gpa) as ranking
from user_profile ) as rk
where ranking=1;