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GATE | GATE-CS-2002 | Question 23

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  • Difficulty Level : Medium
  • Last Updated : 28 Jun, 2021
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Relation R with an associated set of functional dependencies, F is decomposed into BCNF. The redundancy (arising out of functional dependencies) in the resulting set relations is.
(A) Zero
(B) More than zero but less than that of an equivalent 3NF decomposition
(C) Proportional to the size of F+
(D) Indeterminate


Answer: (A)

Explanation: If a relational schema is in BCNF then all redundancy based on functional dependency has been removed, although other types of redundancy may still exist.
Source: http://en.wikipedia.org/wiki/Boyce%E2%80%93Codd_normal_form

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