title: Querying with Redis?
body: <p>I've been learning Node.js so I decided to make a simple ad network, but I can't seem to decide on a database to use. I've been messing around with Redis but I can't seem to find a way to query the database by specific criteria, instead I can only get the value of a key or a list or set inside a key.</p>
  
  <p>Am I missing something, or should I be using a more robust database like MongoDB?</p>