Joins

Hi,
I'm trying to get a list of all the rows in the Parts table, with
the integer indexes of man_id, case_id, and desc_id, replaced with text
from their respective tables. In the Parts table, any of man_id, case_id,
and desc_id may be absent:

Table1, Parts:

   part  man_id  case_id  desc_id
   ------------------------------
   text  int     int      int

Table2: Manufacturers:

   man_id  manufacturer
   --------------------
   int     text

Table3, Cases:

   case_id  case
   -------------
   int      text

Table4, Descriptions:

   desc_id  description
   --------------------
   int      text


Is this right? :

   SELECT part, manufacturer, case, description
   FROM parts LEFT OUTER JOIN manufacturers, cases, descriptions
   NATURAL