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