Question
Consider a relation with schema T(A, B, C, D) and with FD's AB -> C, BC -> D, CD -> A, and AD -> B.
Consider a relation with schema T(A, B, C, D) and with FD's AB -> C, BC -> D, CD -> A, and AD -> B.
a) What are all the nontrivial FD's that follow from the given FD's? You should restrict yourself to FD's with single attributes on the right side. b) What are all the keys of T? c) What are all the superkeys for T that are not keys?
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Temporal Databases Research And Practice Lncs 1399
Authors: Opher Etzion ,Sushil Jajodia ,Suryanarayana Sripada
1st Edition
3540645195, 978-3540645191
