SELECT VoGroup.NAME,
       VoGroup.VEHICLE_OWNER_ID,
       VoGroup.VO_GROUP_ID,
       VoGroup.Parent_Vo_Group_Id,
VoGroup.COMPANY_NR,
       gu.gui_user_id
  FROM (SELECT VoGroup.vo_Group_id,
       VoGroup.name,
       VoGroup.Vehicle_Owner_Id,
       VoGroup.Parent_Vo_Group_Id,
VoGroup.COMPANY_NR
  FROM VO_GROUP VoGroup
 START WITH VoGroup.Parent_Vo_Group_Id IS NULL
CONNECT BY VoGroup.Parent_Vo_Group_Id = PRIOR VoGroup.Vo_Group_Id
 ORDER SIBLINGS BY VoGroup.name) VoGroup,
   (SELECT *  FROM gu_vehicle_owner
                     WHERE gui_user_id = ?
                       AND vehicle_owner_id = ?) gu
 WHERE VoGroup.vo_group_id = gu.vo_group_id(+)
 AND VoGroup.vehicle_owner_id = ?