CREATE or replace FUNCTION patoper(integer) RETURNS character
    AS $_$select opv_pat_tractor from opervehi where opv_idoper = $1 limit 1;$_$
    LANGUAGE sql;

drop function patoper(integer);

CREATE OR REPLACE FUNCTION patoper(integer) RETURNS character
    AS $_$
declare
idoper		 alias for $1;
ret 		 varchar;
auxot		 varchar;
begin

    select opv_pat_tractor into ret from opervehi where opv_idoper = idoper limit 1;

    if ret is null then 
	ret:='A/CARGAR';
    end if;

return ret;
end;$_$
    LANGUAGE plpgsql;


ALTER FUNCTION public.patoper(integer) OWNER TO zona;
