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 user_profile.device_id, user_profile.university, COUNT(question_id) question_cnt, sum(if(question_practice_detail.result='right',1,0)) right_question_cnt from user_profile left join question_practice_detail on user_profile.device_id=question_practice_detail.device_id where user_profile.university='复旦大学' and month(question_practice_detail.date)=8 group by user_profile.device_id