Deleting Order and Customer Data with SQL

During the development and testing process we create different customer and different order in Magento , after the site goes live we need to delete that . So  here are the simple ways to do it with the query below Customer detail can be deleted from the magento admin > Manage Customer. http://www.magentocommerce.com/wiki/import-export_and_data_manipulation/deleting_order_and_customer_data_with_sql