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