We need to verify that α+ (an attribute closure of α under F) either includes all the attributes of the relation Ri or no attributes of ___, for every subset α of attributes in the relation Ri

8. We need to verify that α+ (an attribute closure of α under F) either includes all the attributes of the relation Ri or no attributes of ___, for every subset α of attributes in the relation Ri.

  1. α
  2. Ri+α
  3. Ri-α
  4. Ri

Answer: C) Ri-α

Explanation:

We need to verify that α+ (an attribute closure of α under F) either includes all the attributes of the relation Ri or no attributes of Ri-α, for every subset α of attributes in the relation Ri.

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