select u.device_id,university,
sum(if(result is null,0,1)) question_cnt,
sum(if(result='right',1,0)) right_question_cnt
from user_profile u left join question_practice_detail q on u.device_id=q.device_id and month(q.date)=8 
where university='复旦大学'
group by u.device_id,university