 longer satisfies the partition bounds
    of its original partition.
   </p><p>
    Partitions may themselves be defined as partitioned tables, resulting
    in <em class="firstterm">sub-partitioning</em>.  Although all partitions
    must have the same columns as their partitioned parent, partitions may
    have their
    own indexes, constraints and default values, distinct from those of other
    partitions.  See <a class="xref" href="sql-createtable.html" title="CREATE TABLE"><span class="refentrytitle