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(qpd.device_id) as question_cnt,
sum(case when
qpd.result = 'right' then 1 else 0 end) as right_question_cnt
from
user_profile u
left join
question_practice_detail qpd on u.device_id = qpd.device_id and month(date) = 8
where
university = '复旦大学'
group by
device_id,university
网易游戏公司福利 643人发布