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Key Concepts that Support Data Integrity in a Database

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Explain the key concepts that are involved in supporting data integrity in a database. How is integrity enforced? What are the advantages of enforcing integrity? What are the disadvantages? How do integrity constraints impact the overall application design?

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The solution describes key concepts that support data integrity in a database.

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Data Integrity is an umbrella term that refers to the consistency, accuracy, and correctness of data stored in a database. It is not about physical security, fault tolerance, or data preservation (backups). Data integrity implies that a user can correctly and consistently navigate and manipulate the tables in the database. There are two basic rules to ensure data integrity
(i) Entity integrity: This rule states that the value of the primary key can never be a null value (a null value is one that has no value and is not the same ...

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