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