literal">bernoulli</code> rely
       on the built-in <code class="literal">TABLESAMPLE</code> methods of those
       names. <code class="literal">random</code> works on all remote server versions,
       while <code class="literal">TABLESAMPLE</code> is supported only since 9.5.
       <code class="literal">auto</code> (the default) picks the recommended sampling
       method automatically; currently it means
       either <code class="literal">bernoulli</code> or <code class="literal">random</code>
    