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What Does It Mean To Say That A Database Displays Both Entity Integrity And Referential Integrity?

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Entity integrity describes a condition in which all tuples with a table are uniquely identified by their primary key. The unique value requirement prohibits a null primary key value, because nulls are not unique. Referential integrity describes a condition i which a foreign key value value has a match i the corresponding table or in which the foreign key value is null. The null foreign key value makes it possible not to have a corresponding, but the matching requirement on values that are not null make it impossible to have an invalid value.

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