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What is the canonical cover of the following set F of functional dependencies on the schema (A, B,C)?
A → BC 
B → C 
A → B
AB → C
  • a)
    A → BC
  • b)
    A → B
    B → C
  • c)
    AB → C
    A → B
  • d)
    A → B
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the canonical cover of the following set F of functional depen...
There are two functional dependencies with the same set of attributes on the left side of the arrow:
A → BC
A → B
We can combine these functional dependencies into A → BC.
A is extraneous in AB → C. This is true because B → C is already there in the given set of functional dependencies. 
C is extraneous in A → BC because it is logically implied by A → B and B → C.
Thus, the canonical cover is:
A → B
B → C
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What is the canonical cover of the following set F of functional dependencies on the schema (A, B,C)?A → BCB → CA → BAB → Ca)A → BCb)A → BB → Cc)AB → CA → Bd)A → BCorrect answer is option 'B'. Can you explain this answer?
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