Referential integrity means that every table should have a unique, primary key, whose value is NOT NULL.

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Referential integrity refers to the concept that foreign keys in a database must match primary keys in another table, ensuring consistent and valid relationships between tables. It does not specifically require every table to have a unique primary key that is NOT NULL, although having a primary key is a common practice for uniquely identifying records.

Referential Integrity Means That Every Table Should Have a Unique