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 n.difficult_level,
sum(if(n.result = "right",1,0))/count(n.result) as correct_rate
from
(select c.difficult_level,b.result from user_profile a ,question_practice_detail b,question_detail c
where a.device_id = b.device_id
and b.question_id = c.question_id
and a.university = "浙江大学") n
group by n.difficult_level
order by correct_rate

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