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$sql = "SELECT tr.tax_rate_id, tr.name AS name, tr.rate, tr.type, gz.name AS geo_zone, tr.date_added, tr.date_modified FROM " . DB_PREFIX . "tax_rate tr LEFT JOIN " . DB_PREFIX . "geo_zone gz ON (tr.geo_zone_id = gz.geo_zone_id)";

$sort_data = array(
	'tr.name',
	'tr.rate',
	'tr.type',
	'gz.name',
	'tr.date_added',
	'tr.date_modified'
);	

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