A subsetting criteria is an attribute or concatenated attribute whose finite values divide all entity instances into useful subsets.
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Q19: A candidate key must be a single
Q20: A candidate key may be a single
Q21: A primary key is that candidate key
Q22: An example of domain would be an
Q23: An alternate key is also known as
Q25: A subsetting criteria is also known as
Q26: A subsetting criteria is a domain of
Q27: A relationship is a natural business association
Q28: A relationship may represent an event that
Q29: All data model relationships are unidirectional.
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