EL.)
      Subqueries
      were not supported until <span class="productname">PostgreSQL</span>
      (see below), but they could be imitated in
      <span class="productname">Postgres95</span> with user-defined
      <acronym class="acronym">SQL</acronym> functions. Aggregate functions were
      re-implemented.  Support for the <code class="literal">GROUP BY</code>
      query clause was also added.
     </p></li><li class="listitem"><p>
      A new program
      (<span class="application">psql</span>) 