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$sql = "SELECT *, z.name, c.name AS country FROM " . DB_PREFIX . "zone z LEFT JOIN " . DB_PREFIX . "country c ON (z.country_id = c.country_id)";

$sort_data = array(
	'c.name',
	'z.name',
	'z.code'
);	

if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
	$sql .= " ORDER BY " . $data['sort'];	
} else {
	$sql .= " ORDER BY c.name";	
}

if (isset($data['order']) && ($data['order'] == 'DESC')) {
	$sql .= " DESC";
} else {
	$sql .= " ASC";
}

if (isset($data['start']) || isset($data['limit'])) {
	if ($data['start'] < 0) {
		$data['start'] = 0;
	}		

	if ($data['limit'] < 1) {
		$data['limit'] = 20;
	}	

	$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
}

$query = $this->db->query($sql);

return $query->rows;