Elm04_04 - Chapter 4: Enhanced Entity-Relationship and UML...

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Chapter 4: Enhanced Entity-Relationship and UML Modeling CHAPTER 4: ENHANCED ENTITY-RELATIONSHIP AND UML MODELING Answers to Selected Exercises 4.18 Consider the BANK ER schema of Figure 3.18, and suppose that is is necessary to keep track of different types of ACCOUNTS (SAVINGS_ACCTS, CHECKING_ACCTS, ...) and LOANS (CAR_LOANS, HOME_LOANS, . ..). Suppose that is is also desirable to keep track of each account's TRANSACTIONs (deposits, withdrawals, checks, ...) and each loan's PAYMENTs; both of these include the amount, date, time, . .. . Modify the BANK schema, using ER and EER concepts of specialization and generalization. State any assumptions you make about the additional requirements. Answer: 4.19 Solution Pending 4.20 Identify all the important concepts represented in the library database case study described here. In particular, identify the abstraction of classification (entity types and relationship types), aggregation, identification, and specialization/generalization. Specify (min, max) cardinality constraints whenever possible. List details that will affect the eventual
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Elm04_04 - Chapter 4: Enhanced Entity-Relationship and UML...

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