How to prevent duplicate record in VB/ACCess?

The duplicate records here means except the primary ID field (automatically generated), the value of all the field are the same. What is the easy way in Access/VBA to prevent this kind of duplicate records from being saved in the database (a linked Oracle table)? Thanks.
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Hi heyday2004,

In Oracle you should set a unique index (not primary key) on the field

Patrick MatthewsCommented:
Hello heyday2004,

To prevent duplicates the best way to go is to create a unique index over the field(s) you need watched.  This
page describes how to create indexes on more than one field in Access:

The first example shows how to include more than one field in the index.



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You can also use the DISTINCT keyword.

SELECT DISTINCT InvoiceNbr, CustomerID, InvoiceTotal FROM tblInvoice
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