select date_format(submit_time,'%Y%m') submit_month ,count(id) month_q_cnt ,round(count(id)/avg(day(last_day(submit_time))),3) avg_day_q_cnt from practice_record where score is not null and year(submit_time) = '2021' group by date_format(submit_time,'%Y%m') union all select '2021汇总' submit_month,cou...