I have already read how to create a table with multiple key index, but here's my problem. When I attempt to create this type of index, it says the index can't contain a null value. I certainly understand this, but in my table I have 3 fields I want as keys. Contract ID (auto number), Contract Number, and Order Number. I really need to do the check on Contract Number and Order Number to make sure there are no duplicate entries. However, On many occassions, there is no order number associated with a contract number (it's just a stand-alone contract) so that's where my null values come in. Is there any work around for this or another way to check for duplicate values check both those fields? I don't want there to be any record with the same contract number and delivery order.