Jeff, this will be a different query--a Delete query instead of an Update
query.
This kind of thing:
DELETE FROM Table1 WHERE (Table1.Field1 Is Null) OR (Table1.Field1 = 0);
If Field1 is a Text type field (not a Number type field), put quotes around
the zero.
If your field of table names contain spaces or strange characters, put
square brackets around each name.

Signature
Allen Browne - Microsoft MVP. Perth, Western Australia.
Tips for Access users - http://allenbrowne.com/tips.html
Reply to group, rather than allenbrowne at mvps dot org.
>I setup an Update Query and I would like to Build and Expression to
> Delete a row if the Field Value is Null or "0"
> What would the Expression look like?
>
> Thanks
> Jeff
The where clause might look like:
WHERE Nz([the un-named field],0)=0

Signature
Duane Hookom
MS Access MVP
--
>I setup an Update Query and I would like to Build and Expression to
> Delete a row if the Field Value is Null or "0"
> What would the Expression look like?
>
> Thanks
> Jeff