Create a new table named Customers_Statistics with the following columns: Customer_id, Customer_Last_Name, Number_of_Orders, Number_of_Items Complete the table definition by choosing the appropriate data types, primary and foreign keys.

1) Functions: a. Create a function that has the Customer_id as input and returns a number that represents the total cost of orders for this customer. Notice that you will need to multiply the Order_Qty from table order_details and the Unit_Price from table items to get the total cost of each order. b. Now use the function: Write a select statement that selects all the customers and the total cost of the orders they have ever made.

17. Procedure: a. Write a procedure that has as input the customer_id. Then the procedure should delete the corresponding customer from table customers. b. Notice that customer_id is a foreign key on table orders. Therefore, the customer cannot be deleted if he has placed orders. To delete a record from customers you should first delete the corresponding orders and to do that you need to first delete the corresponding order_details. c. Now execute the procedure to delete customer with id 1. d. ROLLBACK; and all these changes will be undone!