mysql 分組加序號

-- 當月 最大最小排序 ，分組排序編號  加工基礎數據A (總共 AB） 
SET  @row_number1 :=0;
SET  @datee_uid1 :='';

drop table orderinfo1017_1;
create table orderinfo1017_1 as 
select 
(@row_number1:=case when  @datee_uid1=concat(date_format(info.StartTime ,'%Y-%m'),info.MemberID ) then @row_number1+1 else 1 end )  num_mm1_
,@datee_uid1 :=concat(date_format(info.StartTime ,'%Y-%m'),info.MemberID ) as datee_uid
,info.*
from 
(select v_.* from orderinfo1017_ v_ order by MemberID,StartTime asc) info 
,(Select  @row_number1 :=0 ) as b 
order by info.MemberID
,info.StartTime asc