is common to want to
      remove partitions holding old data and periodically add new partitions for
      new data. One of the most important advantages of partitioning is
      precisely that it allows this otherwise painful task to be executed
      nearly instantaneously by manipulating the partition structure, rather
      than physically moving large amounts of data around.
    </p><p>
     The simplest option for removing old data is to drop the partition that
     is no longer necessary:
</p><pre c