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,university,count(question_id) as question_cnt, count(if(result = 'right',1,null)) from user_profile u left join question_practice_detail q on u.device_id = q.device_id and month(q.date) = 8 where university = '复旦大学' group by u.device_id
