[Zend / Postgresql] Select query using limit and offset

I'm starting to use Zend Framework and would like to use a query with limit and offset, as the resultset is rather large. If I use the fetchLatest function (see below), I get 10 rows back. I have two questions about this:

1) If I use the fetchSubset function I get an error (Fatal error: Call to undefined method). I suppose I should import a library or something, but don't know how and what.
2) Is there a better method of using limit and offset than the query() function?
class Countries extends Zend_Db_Table
	function fetchLatest($count = 10)
		return $this->fetchAll(null, 'id desc', $count); 
	function fetchSubset($limit = 10, $offset = 0)
		$sql = 'select * from countries order by id limit '.$limit.' offset ' . $offset;
		return $this->query($sql); 

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Doesn't this work ? :

$table->fetchAll(null,'id desc', $count, $offset);

Or :

$select = $table->select()->order('id desc')->limit($count, $offset);
$rows = $table->fetchAll($select);

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R7AFAuthor Commented:
Thank you!
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