******I ONLY NEED PART 4, 5 AND 6*******

Part 01 In this part you will learn how to create and use triggers: 1. Create a table called Customer Archives that has the same columns as customers table and it also has a column that is called "Deletion_Date" 2. Create a Trigger on table Customers so that every time a record is deleted from table customers this same record is inserted in table Customer_Archives with the current date as Deletion Date 3. Now insert a new customer into table Customers and then delete it. Is the record i Part 02 In this part we will learn how to use functions: 1. Create a functions 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. 2. Now use the function: Write a select statement that selects all the customers and the total cost of the orders they have ever made. Part 03 Write a select statement that selects the second highest invoice_total. Part 04 Now let's create a view: 1. Create a view that holds information (name and phone numbet) for bad payers i.e. the payers that have a payment date that is later (larger) than the invoice due date or have a payment date that is null. Include also the invoice_id. 2. Use the view: write a select statement to find the bad payers whose name starts with 'B'. Part 05 In this part we create a small procedure: 1. Write a procedure that has as input the customer_id. Then the procedure should delete the corresponding customer from table customers. 2. 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. 3. Now execute the procedure to delete customer with id 1. If you have solved part 01 a record will be inserted into Customer_Archives. 4. ROLLBACK; and all these changes will be undone! Part 06 Use the metadata tables for users to count how many tables and how many indexes you have created in your database