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Question: Define the "integrity rules"

Answer: There are two Integrity rules.
� Entity Integrity: States that �Primary key cannot have NULL value�
� Referential Integrity: States that �Foreign Key can be either a NULL value or should be Primary Key value of other relation.

There are two Integrity rules.
� Entity Integrity: States that �Primary key cannot have NULL value�
� Referential Integrity: States that �Foreign Key can be either a NULL value or should be Primary Key value of other relation. Source: CoolInterview.com

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