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,
sum(q.result='right') as right_question_cnt
from user_profile u
left join question_practice_detail q
on u.device_id=q.device_id
where u.university = '复旦大学'
group by u.device_id
