title: MYSQL select data that is older then 2 years
body: <p>So I want to purge some data from the system which is older then 2 years.</p>
  
  <p>I have a datetime field where I store.</p>
  
  <p>I know I can do something like </p>
  
  <pre><code>SELECT * FROM `table` where date_field &lt; (??? what goes here)
  </code></pre>
  
  <p>My problem is i think how do I calculate the date, or maybe I am confused</p>