/* Four SELECT statements needed in total to solve all queries below.

Query 1.

Write one SELECT statement to display SupplierID and Avg_UnitPrice of each supplier. Avg_UnitPrice is the average unit price of products of a supplier. Sort output by SupplierID.

Hint: all suppliers are included

Query 2.

Copy the statement of Query 1 and modify it to display SupplierID and Avg_UnitPrice of suppliers whose average unit price is between $15 and $22. Sort output by SupplierID.

Hint: 8 suppliers

Query 3.

Copy the statement of Query 2 and modify it to display SupplierID and Avg_UnitPrice of suppliers whose average unit price is ranked #1 and #2 (i.e., the highest two averages).

Hint: 3 suppliers

Query 4.

Copy the statement of Query 3 and modify it to display the same output plus two more columns: CompanyName and Phone of each included supplier.

Hint: 3 suppliers, join Suppliers table

*/