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
with tiaojian as ( select uid from exam_record group by uid having count(submit_time)/count(distinct month(submit_time))>=3 ) select tag, count(tag) as tag_cnt from tiaojian t inner join exam_record ed on t.uid=ed.uid inner join examination_info ef on ef.exam_id=ed.exam_id group by tag order by tag_cnt desc
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