troubleshooting Question

How to define combination of fields as a non duplicate combination.

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Fritz PaulFlag for South Africa asked on
Microsoft Access
3 Comments1 Solution105 ViewsLast Modified:
I have a table with some fields. Two of them are Nr (string) and Anno (integer). Each of these two may exist as duplicates, but the combination of any two may only exist once. Is there a way to define the table to ensure that?
(The reason is that Nr refers to a customer and Anno refers to a year and each customer may only occur once each year.)
Thanks.
SShot of table design
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