title: Comparing datasets
body: <p>I have 2 datasets.  1 containing the columns origin_zip(number) and destination_zip(char) and tracking_number(char) and the other containing zip.</p>
  
  <p>I would like to compare these 2 datasets so I can see all the tracking numbers and destination_zips that are not in the zip column of the second dataset.</p>
  
  <p>Additionally I would like to see all of the tracking_numbers and origin_zips where the origin_zips = the destination_zips.</p>
  
  <p>How would I accomplish this?</p>
  
  <pre><code>origin_zip    destination_zip    tracking_number
  12345         23456              11111
  34567         45678              22222
  12345         12345              33333
  
  zip
  12345
  34567
  23456
  
  results_tracking_number
  22222
  33333
  </code></pre>