某乎问答最大连续回答问题天数大于等于3天的用户及其对应等级
某乎问答最大连续回答问题天数大于等于3天的用户及其对应等级
https://www.nowcoder.com/practice/e080f8a685bc4af3b47749ca3310f1fd
select q1.author_id,author_level,round(length(group_concat(distinct answer_date))/10) as days_cnt from answer_tb q1 left join author_tb q2 on q1.author_id=q2.author_id group by q1.author_id,author_level having days_cnt>=3