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create or replace function fun(p_mon in varchar2) return number is
Result number;
declare
p_rank number;
begin
select rn into p_rank
from (select mon, rownum rn
from (select mon
from (select '1ÔÂ' mon, 1ÔÂÏúÁ¿ sale
from table
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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