li class="listitem"><p>
        Using <code class="literal">ONLY</code> to add or drop a constraint on only
        the partitioned table is supported as long as there are no
        partitions.  Once partitions exist, using <code class="literal">ONLY</code>
        will result in an error for any constraints other than
        <code class="literal">UNIQUE</code> and <code class="literal">PRIMARY KEY</code>.
        Instead, constraints on the partitions
        themselves can be added and (if they are not 