title: MySQL Performance - JOIN ON vs JOIN USING on multiple tables
body: <p>Speaking in principle, which one is faster:</p>
  
  <pre><code>SELECT FROM t1 INNER JOIN t2 INNER JOIN t3 ON t1.c = t2.c = t3.c
  </code></pre>
  
  <p>vs</p>
  
  <pre><code>SELECT FROM t1 INNER JOIN t2 USING (c) INNER JOIN t3 USING (c)
  </code></pre>