access.mdb unique field

Hello
I have an access.mdb table with three fields
ID Key autonum
supplierID number
StockID          number      
I want to combine supplierID and StockID in one and make it unique
Is this possible in access.mdb?
Regards
John
johnhardyAsked:
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jerryb30Commented:
You could create a composite index of the two fields, making them unique.  This would prevent the combo of the two from being added to the db.
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johnhardyAuthor Commented:
Thanks
Can you please say how I create a composite field in access please?
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adraughnCommented:
In table design, select both fields and then set primary key by selecting the key from the toolbat. This will prevent duplicates of records where both id's are identical.

If you need to show the combination of the fields in a query/form/report, just use this as an expression:

in access:
Expr1: [SupplierID] & [StockID]

in SQL:
[SupplierID] + [StockID] AS Expr1

-a
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jerryb30Commented:
To create composite index, open table in design view.
Select View-Indexes, and give index a name. In the fields column, out in the two vields, i below the other, that you want to be unique.
Then, click in index name column. In index properties options, set Unique = yes.
Save your table.
Note, if you have two records with same supplierID and stockID, you will have to get rid of dupes before doing this process.
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johnhardyAuthor Commented:
Many thanks for the answers.

Very helpful
Regards
John
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