title: Calculate percentage between two columns in SQL Query as another column
body: <p>I have a table with two columns, number of maximum number of places (capacity) and number of places available (availablePlaces)</p>
  <p>I want to calculate the availablePlaces as a percentage of the capacity.</p>
  <pre><code>availablePlaces    capacity
  1                  20
  5                  18
  4                  15
  </code></pre>
  <p>Desired Result:</p>
  <pre><code>availablePlaces    capacity  Percent
  1                  20        5.0
  5                  18        27.8
  4                  15        26.7
  </code></pre>
  <p>Any ideas of a SELECT SQL query that will allow me to do this?</p>