SELECT 	stage,d,
		(case d when '03' then '25人及以下'		 
		 when '04' then '26-30人'
		 when '05' then '31-35人'
		 when '06' then '36-40人'
		 when '07' then '41-45人'
		 when '08' then '46-50人'
		 when '09' then '51-55人'
		 when '10' then '56-60人'
		 when '11' then '61-65人'
		 when '12' then '66人及以上' end
		),			
    sum(sum) AS total
   FROM mv_dp_bane_stage_chengxiang
  GROUP BY  d,stage
  
	order by 
(case when stage='小学' then 1 
  when stage='初中' then 2
  when stage='高中' then 3
 end),d