From: Emil Rachovsky <zsevgymko@yahoo.com>
To: pgsql-general@postgresql.org <pgsql-general@postgresql.org>
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: problem with overloading the "coalesce" function
Date: Mon, 6 Mar 2006 02:18:12 -0800 (PST)
Message-ID: <20060306101812.89563.qmail@web54308.mail.yahoo.com> (raw)
Hi,
I am trying to overload the "coalesce" function to
accept an integer and a string. Here it is :
CREATE OR REPLACE FUNCTION "coalesce"(a int4, b
"varchar")
RETURNS "varchar" AS
$BODY$
begin
if (a is null ) then
return b;
else
return cast(a as varchar(15));
end if;
end
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION "coalesce"(a int4, b "varchar") OWNER
TO postgres;
I have added it to pg_catalog, but still I cant't use
it, I get an error on the second parameter, apparently
the function gets lost at some point. Any additional
steps I need to complete?
Thanks in advance,
Emil
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To: pgsql-sql@postgresql.org
Cc: zsevgymko@yahoo.com, pgsql-general@postgresql.org
Subject: Re: problem with overloading the "coalesce" function
In-Reply-To: <20060306101812.89563.qmail@web54308.mail.yahoo.com>
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