It is possible to craft the WHERE clause of the query to it evaluates to
TRUE if the control on the form is null.

Switch the query to SQL View.
Locate the WHERE clause. It will be something like this:
WHERE SomeField = [Forms]![ViewEdit Completed Procedures]![SelectOBy]
Change it like this:
WHERE (([Forms]![ViewEdit Completed Procedures]![SelectOBy] Is Null)
OR ([SomeField] Like [Forms]![ViewEdit Completed
Procedures]![SelectOBy]))

Be careful with the bracketing when mixing ANDs and ORs.

This approach quickly gets unwieldy as you add more options.
It is much more efficient to build a filter string dynamically.
This article explains how to do that:
Search form - Handle many optional criteria
at:
http://allenbrowne.com/ser-62.html
Includes a downloadable sample file (free.)

--
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.


"Sue Pari" wrote in message
...
Hi,

I'm trying to pass multiple query criteria from form controls. I'm using
the following type of syntax for the criteria:

Like Nz([Forms]![ViewEdit Completed Procedures]![SelectOBy],"*")

And this works fine for the fields where there are no Nulls in the data,
but if there are Nulls in this field I don't get those records. Quite
understandable since Like "*" doesn't return Nulls.

What I'm trying to do is to return all records when there is nothing
chosen in the selection box on the form. I've tried a bunch of different
IIfs with various use of quote marks, on the order of:

IIf(IsNull([Forms]![ViewEdit Completed Procedures]![SelectOBy]),"Not Is
Null Or Is Null",[Forms]![ViewEdit Completed Procedures]![SelectOBy])

but they either don't get all the records or they kick a "too complex"
error.

I'm sure this must be easier than I'm making it. Could anyone give me
some help?

Thanks in advance,

Sue