Describe entity referential integrity and integrity, Database Management System

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Describe entity referential integrity and integrity. Give an example of each.

Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A cannot accept null values.

Referential Integrity Rule - In referential integrity, it is ensured in which a value in which appears in one association for a given set of attributes also appears for a certain set of attributes in another relation.

For example:

286_Student details.png

Roll No is the primary key within the relation STUDENT and Roll No + Course is the primary key of the relation GRADE. (Entity Integrity)
Roll No in the relation GRADE (child table) is a foreign key, which is referenced from the relation STUDENT (parent table). (Referential Integrity).


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