Re: PL/pgSQL: How to return two columns and multiple rows

Hi

CREATE OR REPLACE FUNCTION public.fx(i integer, OUT a text, OUT b text)
RETURNS SETOF record
LANGUAGE plpgsql
AS $function$
BEGIN
RETURN QUERY SELECT 'foo'||id, 'bar'||id FROM generate_series(1,i) g(id);
RETURN;
END;
$function$

postgres=# SELECT a,b FROM fx(4);
┌──────┬──────┐
│ a │ b │
╞══════╪══════╡
│ foo1 │ bar1 │
│ foo2 │ bar2 │
│ foo3 │ bar3 │
│ foo4 │ bar4 │
└──────┴──────┘
(4 rows)

Regards

Pavel

2015-06-18 14:36 GMT+02:00 Sven Geggus <lists(at)fuchsschwanzdomain(dot)de>:

> Hello,
>
> I supose this is simple, but I did not find a solution in the
> documentation.
>
> I would like to be able to do something like this:
>
> select myfunc('foo','bar');
> or
> select myfunc(foo, bar) from foobartable;
> or even
> select myfunc(foo, bar), 'baz' as baz from foobartable;
>
> Which should return something like this:
> foo | bar
> ------+------
> foo1 | bar1
> foo2 | bar2
> foo3 | bar3
> foo4 | bar4
> (4 rows)
>
> So the output should be at least two columns and (usually) more than one
> row.
>
> What I currently have is the following, which is mostly it. Unfortunately
> it gives me only one column (I really need two) and I would have to create
> a
> custom type:
>
> CREATE TYPE t_foobar AS (foo text, bar text);
>
> CREATE or REPLACE FUNCTION myfunc(foo text, bar text)
> returns SETOF t_foobar as $$
> BEGIN
> FOR i IN 1..4 LOOP
> RETURN NEXT (foo || i::text, bar || i::text);
> END LOOP;
> RETURN;
> END;
> $$ language 'plpgsql';
>
> mydb=> select myfunc('foo','bar');
> myfunc
> -------------
> (foo1,bar1)
> (foo2,bar2)
> (foo3,bar3)
> (foo4,bar4)
> (4 rows)
>
> Regards
>
> Sven
>
> --
> Exploits and holes are a now a necessary protection against large
> corporate interests. (Alan Cox)
>
> /me is giggls(at)ircnet, http://sven.gegg.us/ on the Web
>
>
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