title: SQL is null and = null
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/2749044/what-is-null-and-is-null">what is &ldquo;=null&rdquo; and &ldquo; IS NULL&rdquo;</a><br>
    <a href="https://stackoverflow.com/questions/3777230/is-there-any-difference-between-is-null-and-null">Is there any difference between IS NULL and =NULL</a>  </p>
  </blockquote>
  
  
  
  <p>What is the difference between</p>
  
  <pre><code>where x is null
  </code></pre>
  
  <p>and </p>
  
  <pre><code>where x = null
  </code></pre>
  
  <p>and why does the latter not work?</p>