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List:       postgresql-sql
Subject:    Re: [SQL] sorting months according to fiscal year
From:       Gavin Flower <GavinFlower () archidevsys ! co ! nz>
Date:       2011-08-22 23:58:15
Message-ID: 4E52ED17.9070204 () archidevsys ! co ! nz
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On 23/08/11 01:27, Enzen user wrote:
> Hi
> I have to  rearrange the months according to the fiscal year i.e from April
> to march and use the same in the order by clause of a query.
> I have written the following postgresql function for the same, but to_number
> is returning an error.
> Can you please tell me where i'm going wrong?
> Instead of the function to_number can you suggest any other function that
> will convert a particular month to its corresponding month number(ex:
> april=4 or jan=1)
> 
> 
> CREATE FUNCTION sort_month(to_number('April','MM')) RETURNS numeric AS $$
> DECLARE
> 
> BEGIN
> 
> CASE WHEN 4 THEN 1
> WHEN 5 THEN 2
> WHEN 6 THEN 3
> WHEN 7 THEN 4
> WHEN 8 THEN 5
> WHEN 9 THEN 6
> WHEN 10 THEN 7
> WHEN 11 THEN 8
> WHEN 12 THEN 9
> WHEN 1 THEN 10
> WHEN 2 THEN 11
> WHEN 3 THEN 12
> ELSE 0
> END;
> 
> 
> 
> $$ LANGUAGE plpgsql;
> 
> 
> 
> --
> View this message in context: \
> http://postgresql.1045698.n5.nabble.com/sorting-months-according-to-fiscal-year-tp4723409p4723409.html
>  Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
> 
You might find the following faster...

DROP FUNCTION IF EXISTS
     sort_mont
     (
         to_number int
     ) ;

CREATE FUNCTION
     sort_mont
     (
         to_number int
     )
     RETURNS numeric
     LANGUAGE plpgsql
AS
$$
     BEGIN
         RETURN 1 + (to_number + 8) % 12;
     END;
$$;

SELECT sort_mont(1);
SELECT sort_mont(12);

/// output..

gavin=> \i modulus_stored_proc.sql
DROP FUNCTION
CREATE FUNCTION
  sort_mont
-----------
         10
(1 row)

  sort_mont
-----------
          9
(1 row)

gavin=>



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