With the Reverse Engineer Wizard in Microsoft Office Visio Professional, you can create a database model from an existing database or a Microsoft Office Excel workbook. Database models graphically show the structure of a database so you can see how database elements, such as tables and views, relate to each other without showing the actual data. This can streamline creating a new database or understanding the structure of an existing one.

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http://office.microsoft.com/en-us/visio/HA101154851033.aspx