Referential integrity is a subset of data integrity that ensures that all references are valid. In the context of relational databases, it requires that if a value of one attribute (column) of a relation (table) references a value of another attribute (either in the same or a different relation), then the referenced value must exist. Maintaining data integrity is a crucial part of working with databases.
Referential integrity requires that whenever a foreign key value is used it must reference a valid, existing primary key in the parent table. Declarative Referential Integrity (DRI) is one of the techniques in the SQL database programming language to ensure data integrity. A table (called the referencing table) can refer to a column (or a group of columns) in another table (the referenced table) by using a foreign key.
Here are some websites that discuss Referential Integrity Occurs:
- https://database.guide/what-is-referential-integrity/
- https://en.wikipedia.org/wiki/Referential_integrity
- https://teachcomputerscience.com/referential-integrity/
I hope this helps. Let me know if you have any other questions.
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