title: What's the difference between BigQuery and Bigtable?
body: <p>Is there any reason why someone would use Bigtable instead of BigQuery? Both seem to support Read and Write operations with the latter offering also advanced 'Query' operations.</p>
  <p>I need to develop an affiliate network (thus I need to track clicks and 'sales') so I'm quite confused by the difference because BigQuery seems to be just Bigtable with a better API.</p>