SQL: NORTHWIND

-Display the average unit price, the average quantity, the average product sales, the total product sales for all orders. Product Sales is a calculate field: Unit Price * Quantity * (1Discount). Use the Products table Unit Price. There should be only one row.

- 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).

-Using the ALL keyword create a query that returns orders that have a quantity larger than the quantities ordered for the product named Chang. Display the Order ID, Order date, Product ID, Quantity ordered, Unit price and discount. The subquery should return all of the quantities ordered for product named Chang.

-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.