题解 | #分组过滤练习题#
找出每个学校GPA最低的同学
http://www.nowcoder.com/practice/90778f5ab7d64d35a40dc1095ff79065
select device_id,up1.university,up1.gpa from user_profile as up1,(select university,min(gpa)as gpa from user_profile group by university)as up2 where up1.university=up2.university and up1.gpa=up2.gpa order by university
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