Aggregate Functions</a></li>
<li class="chapter" data-level="3.3" data-path="sql-intro.html"><a href="sql-intro.html#joins"><i class="fa fa-check"></i><b>3.3</b> Joins</a></li>
<li class="chapter" data-level="3.4" data-path="sql-intro.html"><a href="sql-intro.html#subqueries"><i class="fa fa-check"></i><b>3.4</b> Subqueries</a></li>
<li class="chapter" data-level="3.5" data-path="sql-intro.html"><a href="sql-intro.html#virtual-tables"><i class="fa fa-check"></i><b>3.5</b> Virtual Tables</a></li>
<li class="