这应该有效:

$select = $this->getConnection()->select();
$select->join(
    array('order_shipping'=>$this->getTable('sales/order')),//alias=>table_name
    $this->getConnection()->quoteInto(
        'order_shipping.entity_id = order_grid.entity_id',
        Mage_Sales_Model_Quote_Address::TYPE_SHIPPING
    ),//join clause
    array('shipping_description' => 'shipping_description')//fields to get
);
$this->getConnection()->query(
    $select->crossUpdateFromSelect(
        array('order_grid' => $this->getTable('sales/order_grid'))
    )
);

如果需要，请查看我的扩展名 :)
HTH

If you want, take a look at my extension :)
HTH