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 u1.device_id,u1.university, count(question_id)as question_cnt, sum(case when u2.result='right' then 1 else 0 end) as right_question_cnt from user_profile as u1 left join question_practice_detail as u2 on u1.device_id=u2.device_id and month(u2.date) = '08' where u1.university = "复旦大学" group by u1.device_id;
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