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    Functional Dependencies, Keys and Normalization Practice Questions for GATE CS

    Solve 0+ Functional Dependencies, Keys and Normalization practice questions for GATE CS with answers and detailed solutions. Free sample questions below.

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    Functional Dependencies, Keys and Normalization Practice Questions for GATE CS

    Solve 0+ Functional Dependencies, Keys and Normalization practice questions for GATE CS with answers and detailed solutions. Free sample questions below.

    Chapter Roadmap: Functional Dependencies, Keys and Normalization

    Databases › Functional Dependencies, Keys and Normalization

    Chapter Journey

    Three topics that form the backbone of relational database theory.

    1
    Functional Dependency Inference and Armstrong's Axioms
    The logical rules for deriving new dependencies from a given set. You are here.
    5 PYQs
    2
    Candidate Keys, Closures and Superkeys
    Using attribute closures to find all candidate keys and count superkeys.
    2 PYQs
    3
    Normal Forms, Lossless Decomposition and Dependency Preservation
    1NF through BCNF, checking whether a decomposition loses data or dependencies.
    6 PYQs

    What Is a Functional Dependency?

    What Is a Functional Dependency?

    A **Functional Dependency (FD)** is a constraint between two sets of attributes in a relation.

    Definition
    holds on a relation if, for every valid instance of , any two tuples that agree on all attributes of also agree on all attributes of .
    In plain English: If you know the value of , you can uniquely determine the value of .
    Determinant ()
    The attribute(s) you already know
    Dependent ()
    The attribute(s) you can deduce
    Key point: An FD is a statement about all possible valid instances of the relation, not just the rows you currently see in a table.

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