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,sum(if(pq.result='right',1,0))/count(pq.result) as correct_rate from (select device_id,university from user_profile where university='浙江大学') u left join question_practice_detail pq on u.device_id=pq.device_id join question_detail qd on pq.question_id=qd.question_id group by qd.difficult_level order by correct_rate;
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