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 c.difficult_level,SUM(IF(result='right',1,0))/COUNT(result) AS correct_rate FROM user_profile AS a,question_practice_detail AS b,question_detail AS c WHERE a.university='浙江大学' AND a.device_id=b.device_id AND b.question_id=c.question_id GROUP BY c.difficult_level ORDER BY correct_rate
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