Preventing duplicate entries

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?
Delores_CAsked:
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peter57rConnect With a Mentor Commented:
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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peter57rCommented:
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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Delores_CAuthor Commented:
Can you explain a little more?  Not quite understanding
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Delores_CAuthor Commented:
works great!  Thanks alot
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