title: Adding and taking columns
body: <p>I am using Microsoft Access. I am wondering is it possible to add the column <em>dislikes</em> and take it away from the total of the column <em>likes</em> but at the same time I want it to group by <em>car_id</em> which equals to a parameter, so whatever the user types in as the parameter it groups by that.</p>
  
  <p>This is what I have so far:</p>
  
  <pre><code>SELECT SUM(Likes.like - Likes.dislike) AS AllLikes
  FROM Likes
  GROUP BY car_id
  WHERE car_id = ?
  </code></pre>