 that do use the index.  It will also speed up many table
   update operations because the index does not need to be
   updated in all cases.  <a class="xref" href="indexes-partial.html#INDEXES-PARTIAL-EX1" title="Example 11.1. Setting up a Partial Index to Exclude Common Values">Example 11.1</a> shows a
   possible application of this idea.
  </p><div class="example" id="INDEXES-PARTIAL-EX1"><p class="title"><strong>Example 11.1. Setting up a Partial Index to Exclude Common Values</strong></p><div cla