Attempt all questions using the TSQLV4 database. : Database is here :https://raw.githubusercontent.com/ktaranov/sqlserver-kit/master/Sample_Databases/TSQLV4.sql

5 High freight charges in 2015

Return the ship countries with the highest average freight in 2015, in descending order by average freight.

6 Orders from the customer(s) with the greatest number of orders

Write a query that returns all orders placed by the customer(s) who placed the highest number of orders.

7 High freight charges the last year (the last 12 months)

Return shipcountry, AverageFreight during the last 12 months of order data, using as the end the last OrderDate in Orders.

8 Inventory List

Return EmpID, LastName, OrderID, ProductName, and Qty for all orders.