title: Mysql: Adding Two Columns Together Automatically
body: <p>I have three columns in a mysql database:  Column 1, Column 2, and Column 3.</p>
  
  <p>I want to add columns 1 and 2 together automatically to display the sum in Column 3.</p>
  
  <p>I'd like this to be done automatically, so that when a website user enters values in Column 1 and Column 2, they will automatically see the sum in Column 3.</p>
  
  <p>Thanks.</p>
  
  <p>Neil</p>