title: MySQL order by in mongodb findOne()
body: <p>In my mongo collection, I have several records with timestamps. I want to use <code>findOne()</code> and return the oldest record with a where parameter.</p>
  
  <p>If it's not possible to use <code>findOne()</code>, it's alright. I just need to return the oldest record with a where parameter.</p>
  
  <p>How can this be done in MongoDB?</p>