UML Class Diagrams - Chapter 3 Quiz
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Questions and Answers

Associations in UML Class Diagrams should include a description in which of the following situations?

  • The business purpose of the association is clear.
  • When the association is optional.
  • When the association is mandatory.
  • The business purpose of the association is not clear. (correct)

    • Which of the following is the best way to implement an association between a Cash Disbursements class and a Cash Accounts class?

  • Post the primary key of Cash Disbursements as a foreign key in Cash Accounts.
  • Create a separate table for the association.
  • Use an index in both classes.
  • Post the primary key of Cash Accounts as a foreign key in Cash Disbursements. (correct)

    • Which of the following is not a basic building block of entity-relationship diagrams (ERDs)?

  • Associations (correct)
  • Attributes
  • Entities
  • Relationships

    • Logical database structure models, including UML Class Diagrams, must be able to describe which of the following?

    <p>Entities in the domain of interest</p> Signup and view all the answers

    When implementing the database from a UML class diagram, associations should be mapped to which of the following?

    <p>Foreign Keys</p> Signup and view all the answers

    When implementing the database from a UML class diagram, attributes should be mapped to which of the following?

    <p>Fields</p> Signup and view all the answers

    What symbol represents aggregation in UML Class Diagrams?

    <p>Open diamond</p> Signup and view all the answers

    Which of the following best describes the purpose of a primary key?

    <p>Unambiguously identifies each instance of the class.</p> Signup and view all the answers

    Which of the following is the best description of an association?

    <p>The relationship between two classes.</p> Signup and view all the answers

    Which of the following is not a best practice in preparing UML Class diagrams?

    <p>Model each process separately.</p> Signup and view all the answers

    Which of the following is not a category of operational decision used in creating business rules?

    <p>Event</p> Signup and view all the answers

    Which of the following is not one of the building blocks used for creating UML Class Diagrams?

    <p>Events</p> Signup and view all the answers

    Which of the following is not something a model of database structures must be able to describe?

    <p>The sequence that entities are accessed.</p> Signup and view all the answers

    Which of the following is not a step in using a UML Class model to prepare a database?

    <p>Map Associations to Primary Keys.</p> Signup and view all the answers

    Study Notes

    UML Class Diagrams and Associations

    • Associations should include descriptions when the business purpose is unclear.
    • An example involves a Cash Disbursements class (0..*) and a Cash Accounts class (1..1), implemented by using the primary key of Cash Accounts as a foreign key in Cash Disbursements.

    Entity-Relationship Diagrams (ERDs)

    • ERDs share similarities with UML Class diagrams regarding content and purpose.
    • Associations are not considered a basic building block of ERDs.

    Database Structure Models

    • Logical database structures, including UML Class Diagrams, must effectively describe entities in the relevant domain.
    • When translating UML into a database, associations should be mapped to foreign keys, while attributes correspond to fields.

    Aggregation in UML

    • Aggregation is represented visually by an open diamond shape in UML diagrams.

    Primary Keys and Associations

    • The primary key serves the purpose of uniquely identifying each instance of a class.
    • Associations define the relationships between two classes, which are crucial for understanding the data model.

    Best Practices in UML Class Diagrams

    • Best practices advise against modeling each process separately, promoting integrated and cohesive diagrams.
    • Categories of operational decisions do not include events, which should not be confused with entities or attributes in UML.

    Building Blocks and Structure Limitations

    • Building blocks for UML Class Diagrams exclude events.
    • Database models do not need to describe the sequence in which entities are accessed, focusing instead on structure over process order.

    Steps in Database Preparation with UML

    • In preparing a database from UML Class models, key steps include mapping associations to foreign keys and attributes to table fields but do not involve mapping associations to primary keys.

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    Description

    Test your knowledge on UML Class Diagrams with this Chapter 3 quiz featuring multiple-choice flashcards. Explore associations, multiplicities, and their definitions to strengthen your understanding of UML modeling concepts.

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