Yet, a more complex IT system sits at the basis of the process. Five highly important rules define the relationships between the given entity classes. They will be succinctly presented below:
1. The store registers its customers' information (such as complete name, date of birth, address, e-mail or telephone number)
2. The store has a library of videos with the respective video copies and their location on the shelves
3. A customer can rent a video copy and it would be registered in the video store as being rented
4. Upon returning a copy, it would be placed back on its shelf (at this stage, the customer is also required to make the payment for the purchased service, but this business stage is not included in the software application)
5. The office clerk can receive notifications from the software application whenever a customer is late in returning the rented video copy / copies
Having...
The entities are as follows:
the video store the videos the video copy the customer
The relationships between the class entities, as they are available in the diagram, are best explained in the next lines:
the video store serves several customers; it must serve at least one customer for the business to function the video store possesses several videos; also at least one for it to be a video store each video may have one or more copies each customer may rent one or more video copies
