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--p_monÔ·ݲÎÊý Ϊ1ÔÂ,2ÔÂ.........12ÔÂ
--Èç¹ûlzÖ»ÊÇÏëÇó³ö2Ô嵀 ÄǾͰÑp_monдËÀ°É
create or replace function fun(p_mon in varchar2) return number is
  Result number;
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p_rank number;
begin
  select rn into p_rank
  from (select mon, rownum rn
  from (select mon
  from (select '1ÔÂ' mon, 1ÔÂÏúÁ¿ sale
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  union all
  select '2ÔÂ' mon, 2ÔÂÏúÁ¿ sale
  from table
  union all
  select '3ÔÂ' mon, 3ÔÂÏúÁ¿ sale
  from table
  union all
  select '4ÔÂ' mon, 4ÔÂÏúÁ¿ sale
  from table
  union all
  select '5ÔÂ' mon, 5ÔÂÏúÁ¿ sale
  from table
  union all
  select '6ÔÂ' mon, 6ÔÂÏúÁ¿ sale
 


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