Use <code>-</code> (minus symbol) to order a column in descending
order:</p>
<div class="sourceCode" id="cb4"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="fu"><a href="../reference/arrange_dt.html">arrange_dt</a></span><span class="op">(</span><span class="va">flights</span>, <span class="op">-</span><span class="va">arr_delay</span><span class="op">)</span></span></code></pre></div>
</div>
<div class="section level3">
<h3 id="select-columns-with-select_dt">Select columns