Empty entries

"An example might be fax numbers in a customer database. If you store a Null, it means you don't know whether the customer has a fax number.

If you store a zero-length string, you know the customer has no fax number.
Access gives you the flexibility to deal with both types of 'empty' values."

Nulls and Zero-Length Strings

From John L. Viescas at Viescas.com

Also:
Make Null Zero



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