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 difficult_level , sum(if(result = 'right',1,0)) / count(*) correct_rate from user_profile join question_practice_detail using(device_id) join question_detail using(question_id) where university = '浙江大学' group by difficult_level order by correct_rate;
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