Re: using case to select 'which version to use'

On Thu, Aug 20, 2009 at 10:17 AM, Gerardo Herzig<gherzig(at)fmed(dot)uba(dot)ar> wrote:
> Hi all. I have 2 functions , which returns the same columns, but with
> tottaly different logics. I want to wrap it with a third function, who
> will receive a boolean argument to decide wich sub-function have to use.
>
> I want to use case, so i dont have to use pl/pgsql.
>
> This is a non-working example:
>
>
> CREATE OR REPLACE FUNCTION get_oferta(varchar, varchar, varchar, bool,
> OUT cod varchar , OUT description varchar)
> returns setof record
> security definer
> as
> $$
> select  * from case $4 when true then
>    (select * from get_oferta_from_a($1, $2, $3))
> else
>    (select * from get_oferta_from_b($1, $2, $3))
> end;
> $$ language sql;
>
> Can i use case for a case like this?
>
> Thanks!
> Gerardo

Try:

SELECT *
FROM get_oferta_from_a ($1, $2, $3)
WHERE $4
UNION ALL
SELECT *
FROM get_oferta_from_b ($1, $2, $3)
WHERE NOT $4;