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(question_id) as correct_rate
from
question_practice_detail as qpd
left join user_profile as up
using(device_id)
left join question_detail
using(question_id)
where university ='浙江大学'
group by difficult_level
order by correct_rate;
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