title: Mysql request for column content sum
body: <p>I am working on Joomla for a new website.
  I would like to show the total number of hits for all entries of a component.
  For instance, the table name in mysql is <code>'cars'</code>, and the column name <code>'hits'</code>.</p>
  
  <p>I tried to put several request I found on the web (i paste the code in the module Flexi Content), but nothing shows up.</p>
  
  <p>The module shows in front : <code>"There are currently xx cars on the website"</code>.</p>
  
  <p>Can someone tell me what is the right requests?</p>
  
  <p>Thanks.</p>