Use classic models and extract the following data: 

• The number of postal codes in each country. • All data of the customer with highest credit limit in each country. • Country, city, highest credit limit, lowest credit limit, average credit limit, standard deviation of credit limit of customers, sorted by country and city. • Average order cost of each product: Display the product number and average total cost. • Order number and count of line items that have a unit cost greater than 50, sorted by order number.