lass="xref" href="indexes-partial.html#INDEXES-PARTIAL-EX2" title="Example 11.2. Setting up a Partial Index to Exclude Uninteresting Values">Example 11.2</a> also illustrates that the
   indexed column and the column used in the predicate do not need to
   match.  <span class="productname">PostgreSQL</span> supports partial
   indexes with arbitrary predicates, so long as only columns of the
   table being indexed are involved.  However, keep in mind that the
   predicate must match the conditions used i