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What is an ERD?

  • A model for an end-user
  • A physical database
  • A representation of a conceptual database (correct)
  • A collection of entities

    • What is the ERD?

  • The representation of the conceptual database as viewed by the end-user (correct)
  • The physical database structure
  • The code used to create the database
  • The user interface of the database

    • What is an ERD?

  • A model of an organization's structure
  • A model of an organization's database (correct)
  • A model of an organization's financials
  • A model of an organization's marketing strategy

    • What is the purpose of an ERD?

    <p>To represent the conceptual database as viewed by the end-user</p> Signup and view all the answers

    What are entities in an ER model?

    <p>Distinct objects in the organization to be represented in the database</p> Signup and view all the answers

    What are entities in an ERD?

    <p>Distinct objects in the organization</p> Signup and view all the answers

    What does the ERM refer to as an entity instance?

    <p>A row in a table</p> Signup and view all the answers

    What are entities in an ERD?

    <p>Distinct objects in the organization that are to be represented in the database</p> Signup and view all the answers

    What is an entity type in an ERD?

    <p>A group of objects with the same properties</p> Signup and view all the answers

    What is an entity in the ER model?

    <p>A distinct object in the organization that is to be represented in the database</p> Signup and view all the answers

    What is an entity type?

    <p>A group of objects with the same properties</p> Signup and view all the answers

    What are attributes in an ERD?

    <p>Properties that describe some aspect of the object that we wish to record</p> Signup and view all the answers

    What are derived attributes in an ERD?

    <p>Attributes that are calculated from other attributes</p> Signup and view all the answers

    What are identifiers in an ER model?

    <p>One or more attributes that uniquely identify each entity instance</p> Signup and view all the answers

    What are relationships in an ERD?

    <p>Associations between entities</p> Signup and view all the answers

    Why should multi-valued attributes not be implemented in RDBMS?

    <p>They can cause data redundancy</p> Signup and view all the answers

    What is connectivity in an ERD?

    <p>The relationship classification</p> Signup and view all the answers

    Can multi-valued attributes be implemented in RDBMS?

    <p>No</p> Signup and view all the answers

    What is cardinality in an ERD?

    <p>The minimum and maximum number of entity occurrences associated with one occurrence of the related entity</p> Signup and view all the answers

    What is relationship participation in an ERD?

    <p>Whether the relationship is optional or mandatory</p> Signup and view all the answers

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