
Concept explainers
A cellular operator needs a
Can a customer have an unlimited number of plans?- Can a customer exist without a plan?
- Is it possible to create a plan without knowing who the customer is?
- Does the operator want to limit the types of handsets that can be linked to a specific plan type?
- Is it possible to maintain data regarding a handset without connecting it to a plan?
- Can a handset be associated with multiple plans?
- Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24?
- Is the company able to track a manufacturer without maintaining information about its handsets?
- Can the same
operating system be used on multiple handset types? - There are two relationships between Customer and Plan. Explain how they differ.
- Characterize the degree and the cardinalities of the relationship that connects Customer to itself. Explain its meaning.
- Is it possible to link a handset to a specific customer in a plan with multiple customers?
- Can the company track a handset without identifying its operating system?

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