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,
avg(if(qpd.result="right",1,0))as corret_rate
from user_profile as up
inner join question_practice_detail as qpd
on up.device_id=qpd.device_id
inner join question_detail as qd
on qpd.question_id=qd.question_id
where up.university="浙江大学"
group by qd.difficult_level
order by corret_rate asc;
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