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, sum(if(MONTH(date)=8,1,0)) as question_cnt, sum(if(MONTH(date)=8 and result = 'right',1,0)) as right_question_cnt from user_profile u left join question_practice_detail q on u.device_id=q.device_id where university = '复旦大学' group by u.device_id order by device_id asc
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