Part 03

Write a select statement that selects the second highest invoice_total.

Part 04

Now lets 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.