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<dt>Default:</dt>
<dd>""</dd>
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<h4>unique</h4>
<pre>public abstract&nbsp;boolean&nbsp;unique</pre>
<div class="block">(Optional) Whether the column is a unique key.  This is a 
 shortcut for the <code>UniqueConstraint</code> annotation at the table 
 level and is useful for when the unique key constraint 
 corresponds to only a single column.