题解 | #学生数不大于2的学校的学生情况#
学生数不大于2的学校的学生情况
https://www.nowcoder.com/practice/183822a9122642c491c61ec4d479fddb
select university,count(distinct device_id ) as cnt,group_concat(device_id separator';') as device_list from user_profile group by university having cnt<=2;
