title: Sum across rows in sql table
body: <p>I am relatively new to sql, so this may be an easy one. I have a table that keeps track of individual numbers for people everyday. It looks something like this;</p>
  
  <pre><code>person1 | person2 | person3 | Date
  __________________________________
  2       | 4       | 5       | 12/2/2015
  __________________________________
  3       |  5      |  6      | 12/1/2015
  </code></pre>
  
  <p>What I would like to do is add another column that lists the total completed everyday. Something like this:</p>
  
  <pre><code>person1 | person2 | person3 | Date       | Total completed
  ___________________________________________________________
  2       | 4       | 5       | 12/2/2015  | 11
  ___________________________________________________________
  3       |  5      |  6      | 12/1/2015  | 14
  </code></pre>
  
  <p>I know how to use <code>SUM()</code> on columns, but it doesn't seem to work on rows. Any help is appreciated.</p>