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Data Modeling Fundamentals Flashcards

6 cards from real DMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Data Modeling Fundamentals flashcards as text

  1. Which of the following best defines a data model?

    Answer: An abstract representation of data structures and their relationships

    A data model is an abstract representation that defines data structures, relationships, and constraints within a system.

  2. What are the three levels of data abstraction in the ANSI/SPARC architecture?

    Answer: External, Conceptual, Internal

    The ANSI/SPARC architecture defines three levels: External (user views), Conceptual (logical whole), and Internal (physical storage).

  3. In data modeling, what is an entity?

    Answer: A person, place, object, event, or concept about which data is stored

    An entity is a real-world object or concept — such as a customer, product, or order — about which data is collected.

  4. What does cardinality describe in a data model?

    Answer: The number of instances of one entity related to instances of another

    Cardinality defines how many instances of one entity can be associated with instances of another entity in a relationship.

  5. Which concept represents a property or characteristic of an entity in a data model?

    Answer: Attribute

    An attribute is a property or characteristic that describes an entity, such as a customer's name or birth date.

  6. What is the purpose of a data dictionary in data modeling?

    Answer: To document the definitions, formats, and usage of data elements

    A data dictionary provides authoritative documentation of data element definitions, formats, relationships, and business rules.

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