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=>
