Re: sorting months according to fiscal year

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=>