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
http://www.nowcoder.com/practice/d8a4f7b1ded04948b5435a45f03ead8c
SELECT qd.difficult_level,SUM(if(qpd.result='right',1,0))/COUNT(qpd.device_id) AS corrct_rate FROM user_profile up JOIN question_practice_detail qpd ON up.device_id=qpd.device_id JOIN question_detail qd ON qpd.question_id=qd.question_id WHERE up.university='浙江大学' GROUP BY qd.difficult_level ORDER BY corrct_rate;
投递字节跳动等公司7个岗位 >