title: adding a calculated column on QlikView
body: <p>I'm new on QV and trying to add a column to an existing table.
  I want to add to the sales table a sales revenue column that is the sum of salesprice from products table * quantity from sales table.</p>
  
  <p>All of this because I wish to have a list box of sales revenue. </p>
  
  <p>Thanks in advance to all the helpers!</p>