InterviewSolution
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InterviewSolution
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A2 atrribute please tell |
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Answer» Example-1 : Let a Relation R have attributes {a1,a2,a3} & a1 is the CANDIDATE key. Then how many super KEYS are possible?Here, any superset of a1 is the super key.Super keys are = {a1, a1 a2, a1 a3, a1 a2 a3}Thus we see that 4 Super keys are possible in this case.In general, if we have ‘N’ attributes with one candidate key then the NUMBER of possible SUPERKEYS are 2(N – 1). |
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