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2 Answers

Best answer
44 votes
44 votes

Any superset of a key is also a superkey from definition of a superkey.
So, answer is B.

a superkey can be defined as a set of attributes of a relation schema upon which all attributes of the schema are functionally dependent

edited by
11 votes
11 votes
Here Primary Key IS VY

 

If its SuperKey Any Key It Should  Must Contains VY as Part of it

Option A  VXYZ     So VY is Part of it    Correct

Option B  VWXZ    SO No VY is Subset It Faills It Incorrect

Option  C  VWXY  So VY is Part o f it    Correct

Option D  VWXYZ  So VY is Part of it    it Also  Correct

Answer Is B
Answer:

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