title: Create charts from SQL query
body: <p>I want to create a chart from a join sql query between 2 tables in superset.  </p>
  
  <p>for example , I go to SQL Lab and execute this query :</p>
  
  <pre><code>select film, count("film") from rental r, payment p where r.rental_id=p.rental_id group by("film") order by count("film") limit 20;
  </code></pre>
  
  <p>This returns me a result but how to insert in a chart?</p>
  
  <p>How to create chart from SQL query ?</p>