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Question
The subset of super key is a candidate key under what condition ?
Options:
A .  No proper subset is a super key
B .  All subsets are super keys
C .  Subset is a super key
D .  Each subset is a super key
Answer: Option A


No proper subset is a super keyThe subset of a set cannot be the same set.Candidate key is a set from a super key which cannot be the whole of the super set


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