2020-11-07| YouTube explanation (German) | IHK final exam Winter 2003/2004, GH1 Exercise 2
A telephone provider wants to persist all of their customer data inside a database. After talking with the telephone provider's CEO you receive the following information:
The company provides different rates, like "Mobile Data only" or "Phone flatrate". Each of the company's customer can have any number of phones. Each of those phones has exactly one rate assigned. For the billing, a customer must provide his banking details. There can be only one bank account per customer. A bank account belongs to a bank. Each customer's call is tracked, so the customer can receive a mobile itemization report. Every call has unique call id.
Your task is to create a database model with all primary and foreign keys. Additional attributes (like firstname of customer) are not relevant.