稍微简洁一点
得分不小于平均分的最低分
https://www.nowcoder.com/practice/3de23f1204694e74b7deef08922805b2
select min(score) min_score_over_avg from exam_record e where score >= ( select avg(e1.score) from exam_record e1 inner join examination_info e2 on e1.exam_id = e2.exam_id and e2.tag = 'SQL' ) and exists( select * from examination_info where tag='SQL' and exam_id=e.exam_id )