Question: A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The

A cellular operator needs a database to keep track of its
customers, their subscription plans, and the handsets (mobile phones) that they are

A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The ER diagram in Figure 2-24 illustrates the key entities of interest to the operator and the relationships between them. Based on the figure, answer the following questions and explain the rationale for your response. For each question, identify the element(s) in the E-R diagram that you used to determine your answer. a. Can a customer have an unlimited number of plans? b. Assume a handset type exists that can utilize multiple operating systems. Could this situation be accommodated within the model included in Figure 2-24? c. Is the company able to track a manufacturer without maintaining information about its handsets? d. Can the same operating system be used on multiple handset types? e. There are two relationships between Customer and Plan. Explain how they differ. viagram for Problem and Exercise 2-23

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