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select ´ò¿¨ÈË,
  (case when ´ò¿¨Ê±¼ä > '0900' then '³Ùµ½'
  else ''
  end),
  ...
from T
where ´ò¿¨ÈÕÆÚ >= '20100501' and ´ò¿¨ÈÕÆÚ <='20100531' 
 

where ´ò¿¨ÈÕÆÚ >= '20100501' and ´ò¿¨ÈÕÆÚ <='20100531'  

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SQL code:

with
mm as (select to_date(&mon||'01','YYYYMMDD')+ rownum-1 mday from dual connect by rownum <=31),
yuangong as (select 'Ô±¹¤1' yg from dual
union all
select 'Ô±¹¤2' yg from dual
union all
select 'Ô±¹¤3' yg from dual
),
kaoqing as (select 'Ô±¹¤1' yg,to


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