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Referential integrity states that:.
A. Something assigned to an attribute when no other value applies (N/A) or when the applicable value is unknown;
B. Values of an attribute must be taken from a pre-defined domain;
C. No primary key attribute (or component of a primary key) can be null;
D. Each foreign key value MUST match a primary key value in another relation or the foreign key value must be null;
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Referential integrity states that:.
A. Something assigned to an attribute when no other value appli...
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