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
http://www.nowcoder.com/practice/5bc77e3a3c374ad6a92798f0ead4c744
select level,count(user_info.uid) as level_cnt
from user_info join exam_record on user_info.uid=exam_record.uid
where exam_id in (select exam_id from examination_info where tag='SQL')
and score>80 group by level order by level_cnt desc;
from user_info join exam_record on user_info.uid=exam_record.uid
where exam_id in (select exam_id from examination_info where tag='SQL')
and score>80 group by level order by level_cnt desc;
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