title: Not equal <> != operator on NULL
body: <p>Could someone please explain the following behavior in SQL?</p>
  
  <pre><code>SELECT * FROM MyTable WHERE MyColumn != NULL (0 Results)
  SELECT * FROM MyTable WHERE MyColumn &lt;&gt; NULL (0 Results)
  SELECT * FROM MyTable WHERE MyColumn IS NOT NULL (568 Results)
  </code></pre>