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Quick Access Question about Primary/Composit Keys

Posted on 2014-02-17
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Last Modified: 2014-02-17
I have a table in access and I need to prevent duplicates when two of the fields are duplicated.

So, if just one of them is repeated it is fine. The problem is when a combination of fields are duplicated. Example:

Fields: Lname, Fname, DOB

It is okay if any of those are duplicated on their own. But if Lname and Fname, or Lname and DOB match another record in the table, the table should reject the new record.
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Question by:Megin
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4 Comments
 
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Expert Comment

by:jerryb30
ID: 39866224
Are you wondering how to do that, or if you can have both with the same field (Lname)? Or have two composite keys, with no duplicates?
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Author Comment

by:Megin
ID: 39866231
I am wondering how to do that with Access. I see that I can set a particular field to not accept duplicates and I could set others to not accept duplicates, but I want to make it so that the combination of two fields won't accept duplicates.
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LVL 26

Accepted Solution

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jerryb30 earned 2000 total points
ID: 39866240
Go into table design.
Select View
Indexes
On an empty index name line, create a new index name
On that line, and as many other lines as required, add the field names
Go back to the line with index name, select that, and change the index property to Unique
example
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Author Closing Comment

by:Megin
ID: 39866254
Perfect!  Thank you!

I would not have found that on my own.
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