chapter3
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Questions and Answers

What is displayed in a rectangular box in an ER diagram?

  • Attributes
  • Relationships
  • Value sets
  • Entity types (correct)

    • How are key attributes represented in an ER diagram?

  • They are displayed in double ovals
  • They are underlined (correct)
  • They are italicized
  • They are displayed in rectangles

    • How are multivalued attributes displayed in an ER diagram?

  • In rectangles
  • In double ovals (correct)
  • Underlined
  • In single ovals

    • What are the components that make up a composite attribute connected to in an ER diagram?

    <p>The oval representing the composite attribute</p> Signup and view all the answers

    What does A(e) refer to in the context of attributes?

    <p>The value of attribute A for entity e</p> Signup and view all the answers

    What are the three main concepts of the ER model?

    <p>Entities, attributes, and relationships</p> Signup and view all the answers

    Which of the following is NOT an initial entity type identified for the COMPANY database schema?

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

    What type of attribute is represented by a single oval in an ER diagram?

    <p>Simple attribute</p> Signup and view all the answers

    Which statement about the initial design of entity types is true?

    <p>It may need to be refined by introducing relationships</p> Signup and view all the answers

    What does a relationship in the ER model relate?

    <p>Two or more distinct entities with a specific meaning</p> Signup and view all the answers

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