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From: =?UTF-8?Q?Rodrigo_E=2E_De_Le=C3=B3n_Plicet?= <rdeleonp@gmail.com>
Date: Thu, 20 Aug 2009 11:33:14 -0500
Message-ID: <a55915760908200933p5740cb21i4fcb37f1ea8eb242@mail.gmail.com>
Subject: Re: using case to select 'which version to use'
To: Gerardo Herzig <gherzig@fmed.uba.ar>
Cc: pgsql-sql@postgresql.org
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On Thu, Aug 20, 2009 at 10:17 AM, Gerardo Herzig<gherzig@fmed.uba.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
> $$
> select =C2=A0* from case $4 when true then
> =C2=A0 =C2=A0(select * from get_oferta_from_a($1, $2, $3))
> else
> =C2=A0 =C2=A0(select * from get_oferta_from_b($1, $2, $3))
> end;
> $$ 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;