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