title: Are brackets in the WHERE clause standard sql
body: <p>The course that I am currently doing uses brackets in its WHERE clauses like so:</p>
  
  <pre><code>SELECT bar
  FROM   Foo
  WHERE (CurrentState = 'happy');
  </code></pre>
  
  <p>Is this standard sql ?<br>
  If not then why use them?   </p>
  
  <p>Doesn't seem to be used in the Date &amp; Darwen book I have.</p>
  
  <hr>
  
  <p><strong>EDIT</strong></p>
  
  <p>Just to clarify - I'm referring to 1992 sql standards</p>