title: Change prefix of tables once platform is installed
body: <p>I'm working on a new website. A friend of mine configured Drupal 7 on our hosting service and we started to work. Unfortunately he forgot to add, during the setting phase, a prefix to Drupal standard tables.</p>
  
  <p>Is it possible to change this configuration after having installed Drupal (in order to dont loose the work we have already done after the installation)? </p>
  
  <p>I could do it via SQL code, but I guess that the platform will crash in this way because the code is generated according to the initial settings, right?</p>
  
  <p>(PS: I dont have so much experience with Drupal).</p>
  
  <p>Thanks!</p>