title: CQL check if record exists
body: <p>I'm on my path to learning Cassandra, and the differences in CQL and SQL, but I'm noticing the absence of a way to check to see if a record exists with Cassandra. Currently, the best way that I have is to use </p>
  
  <pre><code>SELECT primary_keys FROM TABLE WHERE primary_keys = blah, 
  </code></pre>
  
  <p>and checking to see if the results set is empty. Is there a better way to do this, or do I have the right idea for now?</p>