题解 | 统计每个用户的平均刷题数
统计每个用户的平均刷题数
https://www.nowcoder.com/practice/f4714f7529404679b7f8909c96299ac4
select up.university,qd.difficult_level, round(count(qd.question_id)/count(distinct qpd.device_id),4)avg_answer_cnt from (select * from user_profile where university = '山东大学') up join question_practice_detail qpd using(device_id) join question_detail qd using(question_id) group by up.university,qd.difficult_level
360集团公司福利 405人发布

