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<a name="@default807"></a><br />
<br />
</dd><dt><font color="black"><b>primary key:</b></font></dt><dd><font color="black"> A numeric key assigned to each row that is used to 
refer to one row in a table from another table. Often the database
is configured to automatically assign primary keys as rows are inserted.
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<br />
</dd><dt><font color="black"><b>relation:</b></font></dt><dd><font color="black"> An area within a database that contains tuples and 
a