ER Diagrams Overview
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Questions and Answers

Which of the following statements is not true about an ER Diagram?

  • Procedures (correct)
  • Relationships
  • Attributes
  • An ER Diagram is a graphical representation of entities and their relationships.

    • Which statement is not correct about ER Diagrams?

  • Composite attributes are represented by ellipses.
  • Weak entities are represented by double rectangles. (correct)
  • Multi-valued attributes are represented by double ellipses.
  • Relationships are represented by diamonds.

    • Which of the following is not a component of an ER Diagram?

  • Relationships
  • Attributes
  • Entities
  • Procedures (correct)

    • Which of the following statements about ER Diagrams is incorrect?

    <p>Cardinality is not a concern in the conceptual phase of database design.</p> Signup and view all the answers

    Which of the following is not true regarding keys in an ER Diagram?

    <p>Keys do not have any significance in ER Diagrams.</p> Signup and view all the answers

    Study Notes

    Entity-Relationship Diagrams (ERDs)

    • ER Diagrams are visual representations of data and relationships within a database.
    • They depict entities, attributes, and relationships between entities.
    • The purpose of an ER Diagram is to design database structures and model data effectively.
    • Cardinality and modality are key concepts used in ER Diagrams to define relationships.
    • Keys are crucial for data integrity and ensuring accurate data retrieval.
    • A primary key uniquely identifies each entity within a table.
    • Foreign keys establish relationships between tables, linking entities based on shared data.
    • Superkeys are a combination of attributes that uniquely identify an entity, possibly including more attributes than a primary key.
    • Candidate keys are potential primary keys, with the ability to uniquely identify an entity.
    • Composite keys are primary keys consisting of multiple attributes working together to uniquely identify an entity.
    • A foreign key constraint ensures data consistency by linking foreign keys to primary keys in related tables.

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    Description

    This quiz covers the basics of Entity-Relationship (ER) diagrams, including their components, attributes, and types of relationships. Learn how to identify entities, relationships, and the concept of cardinality within ER models. Perfect for students looking to understand database design concepts.

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