Re: SRF Functions don't want to return empty tuple

On Mon, 29 Sep 2003, GRIMOIS Eric wrote:

> > On Mon, 29 Sep 2003, GRIMOIS Eric wrote:
> >
> > > CREATE TABLE public.agents (
> > >   numero_age int4 NOT NULL,
> > >   nom_age varchar(30) NOT NULL,
> > >   prenom_age varchar(30) NOT NULL,
> > >   date_entree_age date NOT NULL,
> > >   identite varchar(50),
> > >   CONSTRAINT agents_pkey PRIMARY KEY (numero_age)
> > > ) WITH OIDS;
> > >
> > > INSERT INTO public.agents VALUES (78888, 'PERAVIF', 'JO', '1967-06-18',
> '')
> > >
> > > CREATE FUNCTION public.liste_agents(int4) RETURNS public.agents AS
> 'SELECT *
> > > FROM agents WHERE numero_age = $1'  LANGUAGE 'sql' VOLATILE;
> >
> > Are you sure you don't want setof public.agents if you want to be able to
> > return an empty set?
> >
>
> Yes, you're right. Now, it works.
>
> Thank you very much
>
> The syntax I used was wrong, but is accepted by Postgres. What does it mean

IIRC it means it returns exactly one object of the type defined by
agents.