Computer Science
Design Theory for Relational Database

Question Description

1.         Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if

1.1  The only key is A1.

1.2  The only key is A1 and A2.

1.3  The only key is {A1 A2} and {A3 , A4}.

1.4  The only key is {A1 A2} and {A1 , A3}.

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Final Answer

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if the only key is A1  R will have one superkeys

1.2 only key is A1 and A2 will have four superkeys

1.3 16 superkeys

1.4 100 superkeys

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JoelJoel (52)
Purdue University

Really useful study material!