title: How can I find similar address records?
body: <p>The workflow is like this:</p>
  
  <ol>
  <li>I receive a scan of a coupon with data (firstname, lastname, zip, city + misc information) on it.</li>
  <li>Before I create a new customer, I have to search the database if the customer might exist already.</li>
  </ol>
  
  <p>Now my question: What's the best way to find an existing customer, when there is no unique ID available?</p>
  
  <p>PS: I do have a unique ID in the database, just not on the coupons we receive ;)</p>