题解 | 统计复旦用户8月练题情况
统计复旦用户8月练题情况
https://www.nowcoder.com/practice/53235096538a456b9220fce120c062b3
select u.device_id ,u.university ,ifnull(count(q.question_id),0) question_cnt ,ifnull(sum(case when q.result='wrong' then 0 else 1 end),0) right_question_cnt from user_profile as u left join question_practice_detail as q on u.device_id=q.device_id and month(q.date)=8 where u.university = '复旦大学' group by u.device_id
