select submit_month,month_q_cnt, case when month(submit_month) in (1,3,5,7,8,10,12) then round(month_q_cnt/31,3) when month(submit_month) in (4,6,9,11) then round(month_q_cnt/30,3) when submit_month='2021汇总' then round(month_q_cnt/31,3) else CASE WHEN YEAR(submit_month) ...