"btree-gist.html" title="F.9. btree_gist — GiST operator classes with B-tree behavior"><code class="literal">btree_gist</code></a>
   extension to define exclusion constraints on plain scalar data types, which
   can then be combined with range exclusions for maximum flexibility.  For
   example, after <code class="literal">btree_gist</code> is installed, the following
   constraint will reject overlapping ranges only if the meeting room numbers
   are equal:

</p><pre class="programlisting">
CREATE EXTE