title: What is this operator <=> in MySQL?
body: <p>I'm working on code written by a previous developer and in a query it says,</p>
  
  <pre><code>WHERE p.name &lt;=&gt; NULL
  </code></pre>
  
  <p>What does <code>&lt;=&gt;</code> mean in this query? Is it something equal to <code>=</code>? Or is it a syntax error?</p>
  
  <p>But it is not showing any errors or exceptions. I already know that <code>&lt;&gt;</code> = <code>!=</code> in <a href="http://en.wikipedia.org/wiki/MySQL">MySQL</a>.</p>