题解 | 浙江大学用户题目回答情况

select u.device_id,question_id,result
from question_practice_detail as q
left join user_profile as u
on q.device_id = u.device_id 
where university='浙江大学'
order by question_id asc;



select qpd.device_id, qpd.question_id, qpd.result
from question_practice_detail as qpd
inner join user_profile as up
on up.device_id=qpd.device_id and up.university='浙江大学'
order by question_id