ready contains B-tree
   operator classes for data types <code class="type">int4</code> and <code class="type">int2</code>.
  </p><pre class="programlisting">
ALTER OPERATOR FAMILY integer_ops USING btree ADD

  -- int4 vs int2
  OPERATOR 1 &lt; (int4, int2) ,
  OPERATOR 2 &lt;= (int4, int2) ,
  OPERATOR 3 = (int4, int2) ,
  OPERATOR 4 &gt;= (int4, int2) ,
  OPERATOR 5 &gt; (int4, int2) ,
  FUNCTION 1 btint42cmp(int4, int2) ,

  -- int2 vs int4
  OPERATOR 1 &lt; (int2, int4) ,
  OPERATOR 2 &lt;= (int2, int4