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(IF(qp.result='right',1,0))/COUNT(qp.question_id) correct_rate FROM user_profile up LEFT JOIN question_practice_detail qp ON up.device_id = qp.device_id JOIN question_detail qd ON qp.`question_id`=qd.`question_id` WHERE university='浙江大学' GROUP BY difficult_level order by correct_rate asc;
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