最没有意义 | #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(1) tag_cnt from (select uid, count(score) / count(distinct date_format(start_time, '%Y%m')) c from exam_record where score is not null group by uid) t left join exam_record r on t.uid = r.uid left join examination_info i on r.exam_id = i.exam_id where c >= 3 group by tag order by tag_cnt desc;
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