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