DEXES-PARTIAL"><div class="titlepage"><div><div><h2 class="title" style="clear: both">11.8. Partial Indexes <a href="#INDEXES-PARTIAL" class="id_link">#</a></h2></div></div></div><a id="id-1.5.10.11.2" class="indexterm"></a><p>
   A <em class="firstterm">partial index</em> is an index built over a
   subset of a table; the subset is defined by a conditional
   expression (called the <em class="firstterm">predicate</em> of the
   partial index).  The index contains entries only for those table
   rows that 