Question

1.Explain entity integrity, referential integrity, foreign key with example ?​

Answer 1

Answer:

Referential integrity is the state in which all values of all foreign keys are valid. Referential integrity is based on entity integrity . ... For example, referential integrity ensures that every foreign key value in the DEPT column of the EMP table matches a primary key value in the DEPTNO column of the DEPT table.

Answer 2

Answer:

Referential integrity is the state in which all values of all foreign keys are valid. Referential integrity is based on entity integrity . ... For example, referential integrity ensures that every foreign key value in the DEPT column of the EMP table matches a primary key value in the DEPTNO column of the DEPT table.

Explanation:

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