SETOF

Hi,
I am using Postgresql version 7.2.2
I made a small function...

CREATE FUNCTION ejem1(varchar) RETURNS SETOF to varchar as'
SELECT names from mi_tabla WHERE city = $1; '
language ' SQL ';
 ejem1
------------ Sergio  Carlos  Fernando

When wanting to obtain several columns I do this...

CREATE FUNCTION ejem2(varchar) RETURNS SETOF mi_tabla as'
SELECT * from mi_tabla WHERE city = $1;'
language ' SQL ';
 ejem2
--------------- 137956448  137956448  137956448

The number of registries that return is the correct, the question is, because
it does not return the fields of the table, and that is what in its place
this showing to me...
Greetings and thank you very much!