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 qd.difficult_level,
round(sum(qp.result='right')/count(qd.question_id),4) as correct_rate
from user_profile u
join question_practice_detail qp on u.device_id=qp.device_id and university='浙江大学'
join question_detail qd on qp.question_id=qd.question_id
group by qd.difficult_level
order by correct_rate
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