题解 | #浙大不同难度题目的正确率#
浙大不同难度题目的正确率
https://www.nowcoder.com/practice/d8a4f7b1ded04948b5435a45f03ead8c
select
difficult_level,
sum(result = 'right')/count(*) correct_rate
from
question_practice_detail
left join question_detail on question_detail.question_id = question_practice_detail.question_id
left join user_profile on user_profile.device_id = question_practice_detail.device_id
where university='浙江大学'
group by
difficult_level
order by
avg(result = 'right');
