title: Add columns together for total value
body: <p>I'm trying to add all the size columns from <code>id 1</code> together to get a total value.</p>
  
  <p>The table looks a little bit like this: </p>
  
  <pre><code>-------------
  | id | size |
  -------------
  | 1  | 6289 |
  | 2  | 103  |
  | 1  | 3719 |
  | 3  | 8398 |
  | 1  | 189  |
  -------------
  </code></pre>
  
  <p>How would I add together all the <code>&lt;b&gt;size&lt;/b</code>> from<code>id &lt;b&gt;1&lt;/b</code> to get the total  value <code>(10197)</code> using php and mysql?  </p>