Which of the following normal forms does not exist?
(a) BCNF
(b) PJNF
(c) 5NF
(d) None of the mentioned
(a) BCNF
(b) PJNF
(c) 5NF
(d) None of the mentioned
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The correct option is (d) None of the mentioned
The explanation: All of the mentioned normal forms i.e. BCNF, PJNF, 5NF exist. BCNF is Boyce Codd normal form, 5NF is the fifth normal form and PJNF is project join normal form.