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Home ‣ Database ‣ ER Model and Business Rules See What Others Are Saying!
  • Question

  • Use of a supertype/subtype relationship is necessary when which of the following exists?


  • Options
  • A. An instance of a subtype participates in a relationship that is unique to that subtype.
  • B. An instance of a subtype participates in a relationship that is the same as the other subtypes.
  • C. Attributes apply to all of the instances of an entity type.
  • D. No attributes apply to any of the instances of an entity type.

  • Correct Answer
  • An instance of a subtype participates in a relationship that is unique to that subtype. 

    • More questions

    • 1. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?

    • Options
    • A. Two
    • B. Three
    • C. Four
    • D. Six
      • Discuss
    • 2. With JSP, the coding is done in Java and only in Java.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The NOT EXISTS keyword will be true if any row in the subquery meets the condition.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Indexes may be created or dropped at any time.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Another name for multimedia data is unstructured data.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Because of the need for extensive knowledge of SQL, many database developers choose to automate the redesign process.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The data model produced from the reverse engineering process is a true logical model.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Oracle will let you define Notepad as your default editor, and whenever you type NOTEPAD, SQL*Plus will invoke Notepad.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The left-leaning slash tells Oracle to execute whatever statement is in the buffer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Failure to control confidentiality may lead to loss of competitiveness.

    • Options
    • A. True
    • B. False
      • Discuss

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