title: select sum in sql server using one query
body: <p>I have a table in my database with two columns as <em>int</em> for example <code>cal1</code> and <code>cal2</code>. </p>
  
  <p>I make the sum from each row as in <code>select ( cal1 + cal2) from cat as total</code>, now I want to do the sum from all columns total if is possible.</p>