title: Find all users having rented every car in SQL
body: <blockquote>
    <p>Find all users having rented every car in SQL </p>
  </blockquote>
  
  <p>The database has the following structure (the primary keys are in bold):</p>
  
  <ul>
  <li><code>rent</code> (<strong><code>People</code>, <code>cars</code>, <code>Daterent</code></strong>, <code>ExpectedReturnDate</code>, <code>EffectiveReturnDate</code>)</li>
  <li><code>Lateness</code> (<strong><code>People</code>, <code>cars</code>, <code>Daterent</code></strong>, <code>LatenessFee</code>)</li>
  </ul>
  
  <p>My attempt: </p>
  
  <pre><code>SELECT FROM rent 
  WHERE FORALL cars EXISTS Daterent
  </code></pre>
  
  <p>Can you help me expressing correctly such a query?</p>