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