Re: sorting months according to fiscal year

Hello

2011/8/22 Enzen user <anushka(dot)achaiah(at)enzentech(dot)com>:
> 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 $$

you cannot use to_number function inside param's list

> 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;
>

CREATE OR REPLACE FUNCTION sort_month(int)
RETURNS int -- is wrong to use numeric here
AS $$
...
$$ LANGUAGE sql;

SELECT sort_ month(to_nuber(...))

Regards

Pavel Stehule

>
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