select answer_date,author_id,count(char_len) as cnt
from answer_tb
where month(answer_date)=11
group by answer_date,author_id
having cnt>=3
order by answer_date,author_id
select answer_date,author_id,count(char_len) as cnt
from answer_tb
where month(answer_date)=11
group by answer_date,author_id
having cnt>=3
order by answer_date,author_id