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Fritz Paul
Flag for South Africa asked on

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

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
Microsoft Access

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crystal (strive4peace) - Microsoft MVP, Access

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
crystal (strive4peace) - Microsoft MVP, Access

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Fritz Paul

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Thanks. That was so quick and sooo helpful
crystal (strive4peace) - Microsoft MVP, Access

you're welcome ~ happy to help
Your help has saved me hundreds of hours of internet surfing.
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