Magento: Display number of times a product has been sold in the Product Grid

To display how many time product is sold you have to create a rendered in product grid.
Add this code in your admin grid.

class Techtown_Adminx_Block_Adminhtml_Adminx_Renderer_Salesreturn extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract
{
    public function render(Varien_Object $row)
    {
        $productID =  $row->getId();
        $product = Mage::getModel('catalog/product')->load($productID);
       
        $sku = nl2br($product->getSku());
        //$to = $_product->getResource()->formatDate(time());
        //$from = $_product->getResource()->formatDate(time() - 60 * 60 * 24 * 1);
        $product = Mage::getResourceModel('reports/product_collection')
        ->addOrderedQty(true)
        ->addAttributeToFilter('sku', $sku)
        ->setOrder('ordered_qty', 'desc')
        ->getFirstItem();
        echo '<a href="#" class="adminx-sales-return-grid">'.(int)$product->ordered_qty.'</a>';
    }
}