title: Updating table with trigger for values in same table
body: <p>I have a table with three columns (quantity, product_reference, product_attribute_reference)</p>
  
  <p><a href="http://i.stack.imgur.com/LvgHL.jpg" rel="nofollow">TABLE</a>
  When the cell in "quantity" columns changes values, I would like to change the rest of the cells which have same value of "product_ref" and "product_attribute_reference"</p>
  
  <p>In the example (picture attachment) I would like to update same "quantity" values from red square to "quantity" values of blue square</p>