’t see it in the truncated data above, but there is also a <code class="docutils literal notranslate"><span class="pre">school_name_y</span></code>. Both data sets had a <code class="docutils literal notranslate"><span class="pre">school_name</span></code> column, so <code class="docutils literal notranslate"><span class="pre">pandas</span></code> suffixed the one from <code class="docutils literal notranslate"><span class="pre">demo</span></code> with <code class="docutils literal notranslate"><span clas