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Domain constraints, functional dependency and referential integrity are special forms of _________

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Domain constraints, functional dependency and referential integrity are special forms of _________

(a) Foreign key

(b) Primary key

(c) Assertion

(d) Referential constraint

I got this question in exam.

The origin of the question is Integrity Constraints in portion SQL : Queries, Constraints and Triggers of Database Management

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Best answer
The correct answer is (c) Assertion

Best explanation: An assertion is a predicate expressing a condition we wish the database to always satisfy.

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