1. Retrieve the first names of both employee and his/her manager such that managers first name is NOT Andrew. For subordinates whose manager has the first name Andrew, still show the subordinates first names, along with NULL values for their managers first names.
2. How many orders has each employee handled? Show employee ID and # of orders.
3. Retrieve all employee names who live in USA but are not a Sales Representative (You must use set operators to solve this question).
4. Retrieve all products ordered by the customer 'Island Trading'.
5. Retrieve all products, and their suppliers, who have inventory level
6. How many customers are handled by employees who are located in the same city as customers are?
7. Find products with the highest unit price. Show the name and unit price of products.
8. For each region of UK, and for each city within each region, find out how many orders have been shipped.
9. Among products supplied from London, find the one with the highest unit price, and show the product name and unit price.
10. For each manager with >= 2 subordinates, find out the number of subordinates. Show the employeeID of such managers and the number of his/her subordinates.
11. Find out the freight and its shipped postal code of the lightest freight.
12. Retrieve the distinct name of USA customers in reverse alphabetical order who bought a product called Chai.
13. 

It is the Northwind example.

Suppliers_Products Categories OrderDetails 1 N Shippers Orders-Emplovees Customers