query of queries NULL is not working

I have a QoQ and i AM TRYING TO ADD a where clause
where date is null or not null but it does not work

Select * from myQuery where 0=0 and SignDate is null

but it returns all records
LVL 19
erikTsomikSystem Architect, CF programmer Asked:
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You have to keep in mind that QofQ is comparing against a stored set of data in array and structure like format.   It doesn't use a lot of database functions and concepts.

Try ...   this for is not null

 Select * from myQuery where 0=0 and SignDate != ''

and this for null...

 Select * from myQuery where 0=0 and SignDate = ''

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