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How can I  create an Autonumbering field in a Microsoft SharePoint 2007 List

How can I create an autonumbering field in SharePoint 2007?  In eRoom it was an already defined field.  I can't see a similar feature in SharePoint.  I want to be able to create a unique number for each row created within a list.

Thanks for your help!
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Commented:
Unforutnately I do not have permissions to go into SharePoint Designer.  Is there another way?
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Most Valuable Expert 2013
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Commented:
Hi,
by default each element in a list will get its unique number in the ID field.
The only difference to e.g. an identity column like in SQL Server is, that if you delete the last item, the next one will get this number again.

What is the purpose of your autonumber?

Thanks and HTH
Rainer

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