[dev] Horde_Rdo - DISTINCT query

[Luis Felipe Marzagao/Andamentos]

Hello:

Is this the recommended way of running a SELECT DISTINCT query with 
Horde Rdo?

$mapper = new OrderMapper();

$query = new Horde_Rdo_Query($mapper);
$query->setFields('DISTINCT client_id');

$mapper->find($query);

Will it work on different databases?

Thanks a lot.
Luis Felipe