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(qd.question_id) as question_cnt,
count(case when qd.result='right' then 1 end) as right_question_cnt
from user_profile u
inner join question_practice_detail qd
on u.device_id = qd.device_id
where month(qd.date) = 8
and u.university = '复旦大学'
group by u.university,
u.device_id