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Use http://mysqltutorial.org//tryit/ 4. Write a query to show the total value of each order. 5. Write a query to show the number of employees in

Use http://mysqltutorial.org//tryit/

4. Write a query to show the total value of each order.

5. Write a query to show the number of employees in each office.

6. Write a query to show the number of customers who have not placed any orders.

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