select 
up.device_id
,'复旦大学' as university
,count(question_id) as question_cnt
,sum(if(qpd.result='right', 1, 0)) as right_question_cnt
from user_profile as up
left join question_practice_detail as qpd
on qpd.device_id = up.device_id and month(qpd.date) = 8

where up.university = '复旦大学'
group by up.device_id

热一太牛了！！！码住