Logical operators in Access query

Obviously, logical operators are different between Excel and Access.  I'm only used to the former, and I'm tired of guessing about the latter.  I need an answer ASAP.

I have a query that, for a date field, should pull records if that field is (a) blank or (b) between X & Y.  X & Y are input prompts, so criteria is....>=[X] AND <= [Y].  Tagging on the following never seems to include the blank dates....OR IsNull([fieldname]).  I've tried everything I can, but I don't think I'm understanding how to program "([X] AND [Y]) OR [Z]" into Access.

Help, please.
matsumotodAsked:
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jerryb30Commented:
WHERE datefield Is Null OR datefield Between [x] And [y]
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Microsoft Access

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