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 ei.tag,ei.difficulty,round((sum(score)-max(score)-min(score))/(count(score)-2),1) clip_avg_score from examination_info ei join exam_record er on ei.exam_id = er.exam_id where ei.tag = 'SQL' and ei.difficulty = 'hard';
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