What is the diffrence between Key and Superkey how can we understand ? help me please
mertucci
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Jump to Posthi mertucci,
are in doing data modelling?
Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you …
Jump to Post...If all redundant attributes are removed you get a subset what is called primary key...
I have to make an extension:
Sometimes there are more than one superkey of a relation. In such case also all redundant attributes have to be removed and the remaining subsets of attributes are then …
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tesuji
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mertucci
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tesuji
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