title: Select two columns in one column
body: <p>I have to columns in a table which are nom and prenom.</p>
  
  <p>I want to select the <code>nom</code> column and the <code>prenom</code> column as one result for exemple :</p>
  
  <pre><code>|nom | prenom|  
  |----+-------+
  |AA  | BB    | 
  </code></pre>
  
  <p>I want when I select these two columns to display it as one columnn :</p>
  
  <pre><code>|nom et prénom |
  +--------------+
  |AA BB         |
  </code></pre>