_USER
  | SESSION_USER
</pre></div><div class="refsect1" id="id-1.9.3.43.5"><h2>Description</h2><p>
   <code class="command">ALTER USER</code> is now an alias for
   <a class="link" href="sql-alterrole.html" title="ALTER ROLE"><code class="command">ALTER ROLE</code></a>.
  </p></div><div class="refsect1" id="id-1.9.3.43.6"><h2>Compatibility</h2><p>
   The <code class="command">ALTER USER</code> statement is a
   <span class="productname">PostgreSQL</span> extension.  The SQL standard
   leaves the definitio