Error with Join and Active Record

[eluser]Unknown[/eluser]
Hello

Code:

$this->db->select('marker_id, marker_name, taxon.scientific_name, marker.group_id', FALSE);
$this->db->from('marker, taxon');
$this->db->where('taxon.taxon_id = marker.taxon_id','inner');

it does not work :

Error Number:

SELECT marker_id, marker_name, taxon.scientific_name, marker.group_id FROM "marker", "taxon" WHERE "taxon"."taxon_id" = marker.taxon_id 'inner'

Look at the where clause :
taxon and taxon_id are enclosed by ", marker is not !

Does somebody else use CodeIgniter with an Oracle database ?

Fred