Database - Normalization for Relational Databases

Avatto>>UGC NET COMPUTER SCIENCE>>PRACTICE QUESTIONS>>Database>>Normalization for Relational Databases

1. A relation empdt1 is defined with attributes
empdt1(empcode, name, street, city, state,Pincode).
For any Pincode, there is only one city and state.
Also, forgiven street, city, and state, there is just one Pincode.
In normalization terms, empdt1 is a relation in

  • Option : B
  • Explanation : empdt1 {empcode, name, street, city, state, pincode)
    Given functional dependency
    pincode -> (city) (state)
    (street) (city) (state) -->pincode
    This is in I NF and 2NF but not in 3NF because it contains transitive dependency.
    Hence the correct answer is (b).
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2. A table has fields F1, F2, F3, F4, F5 with the following functional dependencies
Fi —> F3,
F2 —> F4
(FI, F2) —> F5
In terms of normalization, this table is in

  • Option : A
  • Explanation : Primary key (candidates key) for this relation is [F1] [F2] because [F1, F2] column contains [F1, F2, F3, F4, F5]
    So, there is, functional dependency F1 -> F3, F2
    It also has partial dependency so it is not in 2nd, 3rd NF.
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