[Zope] Is there a <dtml-comma> for SQL UPDATEs?

[Guy Davis]

I now have all my insert and select queries working, but am having
trouble with an UPDATE.
For the query:
UPDATE  users
SET 
<dtml-sqlgroup>
<dtml-sqltest login type=nb optional>
<dtml-sqltest email type=nb optional>
</dtml-sqlgroup>
WHERE <dtml-sqltest userid type=int>

This works perfectly except when both login and email are provided
because the query becomes:
UPDATE users
SET login='a_login'
email='an_email'
WHERE id=1 

Without the comma between the login and email, it doesn't work.  I loved
the <dtml-and> and <dtml-or> tags for SELECT statements.  I tried a
<dtml-comma> but no such luck.  Does this exist or do I need to use
separate UPDATE statements for each column, each wrapped in a
<dtml-if>?  

Thanks. 
-- 
       Guy Davis    mailto:davis@arc.ab.ca
  (403) 210-5334    Alberta Research Council