Referential integrity enforces data consistency from "summary" of SQL and Relational Theory by C. Date
Referential integrity is a critical concept in database management that plays a key role in maintaining data consistency within a relational database system. The basic idea behind referential integrity is to ensure that relationships between tables are always valid, meaning that any foreign key value in one table must always correspond to a primary key value in another table. This prevents orphaned records or mismatched data that can lead to inconsistencies and errors in the database. By enforcing referential integrity, a database management system can guarantee that the data remains accurate and reliable at all times. This is achieved through the use of constraints, which are rules that define the relationships between tables and control the actions that can be taken on the data. For example, a referenti...
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