s="pre">x</span></code> and the one from <code class="docutils literal notranslate"><span class="pre">ela</span></code> with <code class="docutils literal notranslate"><span class="pre">y</span></code>.</p>
<p>Because both columns <em>should</em> contain the same data (because they have the save DBN for the same school year), in this case we can just drop one of the columns before the merge. We’ll drop <code class="docutils literal notranslate"><span class="pre">school_name</span></code> from <code class=