I need to display number of sales for a product or a product variation in product list. But I cannot find a decent way to go. Can I count order numbers for a product or a product variation with their relation? How should I do? I looked this thread Drupal Commerce: Number of a sales per product, what he want is a view, but I need to display number of sales in product list. I appreciate for any help or comments.
Look at https://drupal.org/project/commerce_reports and edit your product list View to do what it does in its product sales report.