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
https://www.nowcoder.com/practice/90778f5ab7d64d35a40dc1095ff79065
select a.device_id, a.university, a.gpa from user_profile as a right join ( select university , min(gpa) as gpa from user_profile group by university ) as b on a.university=b.university and a.gpa=b.gpa order by a.university
right join : 联结后的内容为左表和右表的交集+以及交集对应的右表的部分