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
https://www.nowcoder.com/practice/a690f76a718242fd80757115d305be45
select
ei.tag,
ei.difficulty,
round(
(sum(er.score) - min(er.score) - max(er.score)) / (count(er.score) -2),
1
) as clip_avg_score
from
examination_info ei
join exam_record er on ei.exam_id = er.exam_id
where
tag = 'SQL'
and difficulty = 'hard'
- 考点：两表连接，聚合函数的使用
