SQL:NORTHWIND

- Create the following summary query for each ProductName for all Beverage products: List the average quantity ordered, the highest quantity ordered, the average product sales amount, and the total product sales amount (Product Sales is a calculate field: Unit Price * Quantity * (1 Discount)). Use the Unit Price at the time of the sale (Order Details table).

- Create a query using a subquery within the FROM clause to retrieve the top 8 customers based on the number of orders received. The outer query should display the customer id, the date of the first order, the date of the last order and the total number of orders received.