title: Explicit vs implicit SQL joins
body: <p>Is there any efficiency difference in an explicit vs implicit inner join?
  For example:</p>
  
  <pre><code>SELECT * FROM
  table a INNER JOIN table b
  ON a.id = b.id;
  </code></pre>
  
  <p>vs.</p>
  
  <pre><code>SELECT a.*, b.*
  FROM table a, table b
  WHERE a.id = b.id;
  </code></pre>