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
/* score为null的不能算到平均得分里面 */
SELECT tag,difficulty, ROUND((sum(score)-max(score)-min(score))/(count(*)-2),1) clip_avg_score FROM exam_record er INNER JOIN examination_info ei ON er.exam_id=ei.exam_id where tag='SQL' and difficulty='hard' and score is not null;
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