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Preventing duplicate entries

Posted on 2011-09-08
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Last Modified: 2012-05-12
I have a database that I enter refunds checks in, the problem I am having is preventing duplications.

I have two vendors with the same check number, so I can’t make the check number unique.  

I can’t used the vendors’ name because the vendor’s name is used repeatedly used because of multiple checks received.  

Can anyone advise on how I can resolve this issue?
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Question by:Delores_C
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Expert Comment

by:peter57r
ID: 36504242
You have to use both fields.
In your table design create a unique  index based on both fields.
In the index dialog select the name and in the next line select the the check number.
Then assign a name to the index name (e.g. NameNumber) against the Name field and set it to Unique = Yes.
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Author Comment

by:Delores_C
ID: 36504322
Can you explain a little more?  Not quite understanding
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Accepted Solution

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peter57r earned 125 total points
ID: 36504548
Look at the attached example  - you have the table open in design view and choose Indexes from your menu or ribbon.
Then specify both fields in the centre column and give the composite index a name in the left column.
Set the Unique option to Yes as shown.
index.JPG
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Author Closing Comment

by:Delores_C
ID: 36504892
works great!  Thanks alot
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