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 user_profile a where gpa <= all(select gpa from user_profile b where a.university = b.university) order by university
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