On Feb 24, 2008, at 4:19 PM, Kynn Jones wrote:
Suppose that stored procedure foo has the signature:
foo( text, text ) RETURNS SETOF text
Also, I have some table bar, and that column bar.baz is of type text.
Now, I'd like to run something like
SELECT foo( "frobozz", baz ) FROM bar;
If I try this psql complains that I'm trying to execute a set-
valued function in the wrong context.
But the intention of this invalid statement is to apply foo
( "frobozz", ? ) once for each row of bar, replacing ? each time
with the row's value of baz, and concatenate all the returned
tables to produce the final result. (In general, the number of
rows resulting from this application has no relation to the number
of rows in bar; i.e. it can be less than, equal to, or greater than
this number.)
What must I do to get the desired behavior?
There was an article that covered this in the Postgres Online Journal
(http://www.postgresonline.com/journal/index.php?/categories/6-pl-
programming). Basically, do this:
CREATE OR REPLACE FUNCTION foo(text, text)
RETURNS SETOF text
$$
SELECT * FROM foo($1, $2);
$$
LANGUAGE sql;
Erik Jones
DBA | Emma®
erik@xxxxxxxxxx
800.595.4401 or 615.292.5888
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