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 FROM( SELECT device_id, university, gpa, RANK() OVER (PARTITION BY university ORDER BY gpa) rk FROM user_profile ) tb WHERE tb.rk = 1;