From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Returning multiple columns with a function?? |
Date: | 2002-12-17 00:48:53 |
Message-ID: | 3DFE7475.7060508@joeconway.com |
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Thread: | |
Lists: | pgsql-general |
Joshua D. Drake wrote:
> But something like this fails:
>
> CREATE OR REPLACE FUNCTION test_multiple () RETURNS SETOF text AS
> 'SELECT ''a'', ''b''' LANGUAGE 'SQL';
> ERROR: function declared to return text returns multiple columns in
> final SELECT
>
> What are we missing?
Try:
CREATE OR REPLACE FUNCTION test_1 () RETURNS SETOF record AS 'SELECT
''a''::text, ''b''::text' LANGUAGE 'SQL';
regression=# SELECT * FROM test_1() AS t(f1 text, f2 text);
f1 | f2
----+----
a | b
(1 row)
or:
CREATE TYPE mytype AS (f1 int, f2 text);
CREATE OR REPLACE FUNCTION test_2 () RETURNS SETOF mytype AS 'SELECT 1::int,
''b''::text' LANGUAGE 'SQL';
regression=# SELECT * FROM test_2();
f1 | f2
----+----
1 | b
(1 row)
See the info scattered amongst:
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/sql-select.html
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/sql-createtype.html
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/xfunc-tablefunctions.html
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/xfunc-sql.html
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/xfunc-c.html
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/plpgsql-control-structures.html
(and maybe some others)
HTH,
Joe
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