Which of the following is not a condition for the third normal form in the case of XY?(a) X→ Y is trivial(b) X is the superkey for R(c) Each attribute in Y-X is a candidate key for R(d) Each attribute in X-Y is a candidate key for RThe question was asked in a national level competition.Enquiry is from Decomposition Using Functional Dependencies in division Relational Database Design of RDBMS

Which of the following is not a condition for the third normal form in

1.	Which of the following is not a condition for the third normal form in the case of XY?(a) X→ Y is trivial(b) X is the superkey for R(c) Each attribute in Y-X is a candidate key for R(d) Each attribute in X-Y is a candidate key for RThe question was asked in a national level competition.Enquiry is from Decomposition Using Functional Dependencies in division Relational Database Design of RDBMS
Answer» The CORRECT ANSWER is (d) Each attribute in X-Y is a candidate key for R To elaborate: Each attribute in X-Y is a candidate key for R is not a NECESSARY CONDITION for the third normal form in the case of X →Y. X→Y is trivial and X is the superkey of R are necessary conditions for the third normal form.

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