Database Normalization and Functional Dependency
9 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the first rule of normalizing data?

  • Eliminate repeating data (correct)
  • Eliminate redundant data
  • Eliminate partial dependencies
  • Eliminate transitive dependencies
  • Functional dependency refers to the relationship between attributes in a table.

    True

    Define Full Functional Dependency.

    A condition where one attribute is fully dependent on another and not on any subset of that attribute.

    What requires a table to be in Second Normal Form (2NF)?

    <p>It must be in 1NF and every non-key attribute must be fully dependent on the primary key.</p> Signup and view all the answers

    What is the goal of normalization?

    <p>Eliminate update anomalies</p> Signup and view all the answers

    What does Third Normal Form (3NF) ensure?

    <p>It ensures that every non-key attribute is non-transitively dependent on the primary key.</p> Signup and view all the answers

    Boyce-Codd Normal Form (BCNF) handles a case where there might be two primary keys.

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

    What is required for a relation to be in Fourth Normal Form (4NF)?

    <p>It must eliminate multi-valued dependencies</p> Signup and view all the answers

    What is another name for Fifth Normal Form?

    <p>Projection-Join Normal Form</p> Signup and view all the answers

    Study Notes

    Normalization

    • Refers to organizing data to minimize redundancy in relational database design.
    • Eliminates repeated data.
    • Removes redundant data.
    • Eliminates update, delete, and insert anomalies.
    • Follows a series of recommended steps to eliminate redundancy and update anomalies in database design.

    Functional Dependency

    • Describes the relationship between attributes (columns) in a table.
    • Classifications:

      Full Functional Dependency

      - Indicates that if A and B are attributes of a table, B is fully functionally dependent on A if B is functionally dependent on A, but not on any proper subset of A.
      

      Partial Functional Dependency

      • Indicates that if A and B are attributes of a table, B is partially dependent on A if some attributes can be removed from A, and yet the dependency still holds.

      Transitive Functional Dependency

      • Is a condition where A, B and C are attributes of a table such that if A is functionally dependent on B and B is functionally dependent on C then C is transitively reliant on A via B.

    Normal Forms

    • First Normal Form (1NF)
    • States that the domain of an attribute must include only atomic values and that the value of any attribute in a row must be a single value from the domain of that attribute.
    • Second Normal Form (2NF)
      • A relation in 2NF if and only if it is in 1NF and every non-key attribute is fully dependent on the primary key.
      • Eliminates partial dependencies.
    • Third Normal Form (3NF)
      • A relation is in 3NF if and only if it is in 2NF and every non-key attribute is non-transitively dependent on the primary key.
    • Boyce-Codd Normal Form (BCNF)
    • Named after Ry Boyce and Edgar Codd.
    • Handles a problem with an entity that might have two primary keys.
    • Fourth Normal Form (4NF)
      • A relation is in 4NF if and only if a multi-valued dependency (MVD) exists in a table, then all attributes of the table are also functionally dependent on A.
    • Fifth Normal Form (5NF)
      • Also called the projection-join normal form (PJ/NF).
      • A relation is in 5NF if and only if every join dependency in the relation can be represented as a join of projections of the relation.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    MIDTERM DBF REVIEWER.pdf

    Description

    This quiz covers key concepts related to database normalization and functional dependency. You will explore the principles of organizing data to minimize redundancy and the different types of functional dependencies. A deep understanding of these concepts is crucial for effective relational database design.

    More Like This

    Database Normalization and DML Quiz
    6 questions
    Data Normalization and Functional Dependency
    13 questions
    Database Normalization Chapter Review
    48 questions
    Database Design and Normalization Quiz
    60 questions
    Use Quizgecko on...
    Browser
    Browser