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Question: In the context of database normalization, assuming we have a relation schema R [A, B, C, D, E] and the following functional dependencies:{A} → {B, C}{B, D} → {E}{C} → {D}{D} → {A}Which operation can split the relation R into a higher normal form?

Question

Question: In the context of database normalization, assuming we have a relation schema R [A, B, C, D, E] and the following functional dependencies:{A} → {B, C}{B, D} → {E}{C} → {D}{D} → {A}Which operation can split the relation R into a higher normal form?

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Solution

To normalize the given relation schema R [A, B, C, D, E] into a higher normal form, we can use the decomposition operation. Decomposition is a process of breaking down a relation into two or more relations to eliminate redundancy and anomalies.

Here are the steps to decompose the relation R:

  1. Identify the functional dependencies:

    • {A} → {B, C}
    • {B, D} → {E}
    • {C} → {D}
    • {D} → {A}

  2. Identify the candidate keys for the relation. In this case, the candidate keys are {A, D} and {B, D}.

  3. Based on the functional dependencies and candidate keys, decompose the relation into two or more relations.

    We can decompose R into three relations as follows:

    • R1(A, B, C) with functional dependencies {A} → {B, C}
    • R2(C, D) with functional dependencies {C} → {D}
    • R3(B, D, E) with functional dependencies {B, D} → {E}

This decomposition ensures that each relation is in Boyce-Codd Normal Form (BCNF), which is a higher normal form. Each relation now has a superkey, and there are no more non-trivial functional dependencies.

This problem has been solved

Similar Questions

Consider the relation R={A,B, C, D, E}. The primary key of relation is {A, C}. Some additional functional dependencies are {B->E; C->D}. The relations after normalisation area.R(A,B), R2(A,E), R3(A,C), R4(C,D)b.R1(A,B,E), R2(A,C), R3(C,D)c.R(A,B), R2(B,E), R3(A,C), R4(C,E)d.R(A,B), R2(B,E), R3(A,C), R4(C,D)Clear my choice

Properties of RelationalDecompositions (2) Relation Decomposition andInsufficiency of Normal Forms (cont.): Decomposition: The process of decomposing the universal relationschema R into a set of relation schemas D ={R1,R2, …, Rm} that will become the relationaldatabase schema by using the functionaldependencies. Attribute preservation condition: Each attribute in R will appear in at least onerelation schema Ri in the decomposition so that noattributes are “lost”.

What is the primary focus of Join Dependencies in database normalization?Reducing redundancy caused by functional dependenciesHandling relationships between tables in a relational databaseEnsuring atomicity of dataAddressing redundancy due to relationships between multiple tablesNext

Which normalization form eliminates transitive dependencies?Review LaterFirst Normal Form (1NF)Second Normal Form (2NF)Third Normal Form (3NF)Boyce-Codd Normal Form (BCNF)

What is the first step in the normalization process?ACreate a First Normal tableBIdentify transitive dependenciesCCreate an Un-Normalized table

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