title: Function sum with HQL language
body: <p>I have a question (sorry about my English, I'm learning)! 
  I searched everywhere for how to use the command <code>sum(column)</code> with <code>HQL</code> hibernate language, but I can't find anything!</p>
  
  <p>I can do it with <code>SQL</code> language. Example: </p>
  
  <pre><code>SELECT sum(Column) FROM tablethatIwantthevalues;
  </code></pre>
  
  <p>but not with HQL Hibernate!</p>