title: How different is WHERE id IN(4) versus WHERE id = 4?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/3417074/why-would-an-in-condition-be-slower-than-in-sql">Why would an IN condition be slower than &ldquo;=&rdquo; in sql?</a>  </p>
  </blockquote>
  
  
  
  <p>Is there any performance difference between doing:</p>
  
  <pre><code>SELECT foo FROM bar WHERE id IN (4)
  </code></pre>
  
  <p>Versus</p>
  
  <pre><code>SELECT foo FROM bar WHERE id = 4
  </code></pre>