en="true"></a><span class="co">## or using the functional form</span></span>
<span id="cb11-12"><a href="#cb11-12" aria-hidden="true"></a><span class="co"># flights[, `:=`(delay = NULL)]</span></span></code></pre></div>
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<h4 class="bs-callout bs-callout-info"></h4>
<ul>
<li><p>Assigning <code>NULL</code> to a column <em>deletes</em> that column. And it happens <em>instantly</em>.</p></li>
<li><p>We can also pass column num