#思路：
#①选出SQL的exam_id；
#②将前一步选出的exam_id作为子查询，选出这些exam_id对应的score和平均分；
#③选出score>=平均分情况下的min(score)即可。

select min(score)
from
(select score, avg(score)over() a
from exam_record
where exam_id in (select exam_id from examination_info where tag='SQL')
) as tb1
where score>=a