Select a custom column with Propel in Symfony 1.4

Here's a snippet, which allows you to select only one column in a query, and access to the result in symfony.
$c = new Criteria();
$c->clearSelectColumns();
$c->addSelectColumn(objectPeer::COUNTRY);
$c->setDistinct();
$res = objectPeer::doSelectStmt($c);
while ($row = $res->fetch()) {
$country = $row[0];
}
?>
Works with Propel 1.4 and symfony 1.3/1.4.