From: Gerardo Herzig <gherzig@fmed.uba.ar>
To: "Rodrigo E. De León Plicet" <rdeleonp@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: using case to select 'which version to use'
Date: Fri, 21 Aug 2009 15:13:41 -0300
Message-ID: <4A8EE3D5.3050501@fmed.uba.ar> (raw)
In-Reply-To: <a55915760908200933p5740cb21i4fcb37f1ea8eb242@mail.gmail.com>
References: <4A8D6912.60207@fmed.uba.ar>
<a55915760908200933p5740cb21i4fcb37f1ea8eb242@mail.gmail.com>
Rodrigo E. De León Plicet wrote:
> 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
>> $$
>> select * from case $4 when true then
>> (select * from get_oferta_from_a($1, $2, $3))
>> else
>> (select * from get_oferta_from_b($1, $2, $3))
>> end;
>> $$ 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;
>
>
Well, looks like it will work. I think i found the right syntax now:
select foo.* from
(select case $4 when false then
get_oferta_from_a($1, $2, $3)
else
get_oferta_from_b($1, $2, $3)
end) as foo;
Thanks!
Gerardo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: gherzig@fmed.uba.ar, rdeleonp@gmail.com
Subject: Re: using case to select 'which version to use'
In-Reply-To: <4A8EE3D5.3050501@fmed.uba.ar>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox