at are used to join with 
 the primary table.
 <p> Defaults to the column(s) of the same name(s) 
 as the primary key column(s) in the primary table.</div>
<dl>
<dt>Default:</dt>
<dd>{}</dd>
</dl>
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<h4>foreignKey</h4>
<pre>public abstract&nbsp;<a href="../../javax/persistence/ForeignKey.html" title="annotation in javax.persistence">ForeignKey</a>&nbsp;fore