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,university,
count(qpd.question_id) as question_cnt,
sum(if(qpd.result='right',1,0)) 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 or null
where university='复旦大学'group by up.device_id
;
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