题解 | #SQL类别高难度试卷得分的截断平均值#
SQL类别高难度试卷得分的截断平均值
http://www.nowcoder.com/practice/a690f76a718242fd80757115d305be45
SELECT e.tag, e.difficulty, round( (SUM(er.score) - max(er.score) - min(er.score)) / (count(er.score) - 2), 1) as clip_avg_score
from examination_info e join exam_record er using(exam_id)
where tag = 'SQL' and difficulty = 'hard';
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