题解 | #月均完成试卷数不小于3的用户爱作答的类别#
月均完成试卷数不小于3的用户爱作答的类别
https://www.nowcoder.com/practice/b1d13efcfa0c4ecea517afbdb9090845
select tag, count(tag) tag_cnt from exam_record join examination_info using(exam_id) where uid in (select uid from exam_record group by uid,date_format(submit_time,'%Y%m') having count(submit_time)>=3 ) group by tag order by tag_cnt desc
