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Change the data type of the Date Purchased field to Date/Time, and its format to 12/31/99.

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Save the Books table, then close it.
TIP: An alert window will appear saying there was an error, due to changing the Date Purchased data type.
Click the
button.
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Open the Relationship design window.
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Add the two tables: Books and Authors.
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the Author ID fields of the Author and Books tables.