题解 | #作答试卷得分大于过80的人的用户等级分布#
作答试卷得分大于过80的人的用户等级分布
https://www.nowcoder.com/practice/5bc77e3a3c374ad6a92798f0ead4c744
select
t1.level as level ,
count(t1.level) as level_cnt
from user_info t1
left join exam_record t2
on t2.uid = t1.uid
left join examination_info t3
on t3.exam_id = t2.exam_id
where t3.tag = 'SQL'
and t2.score > 80
group by level
order by level_cnt desc
/*SQL*/;