Web Reference: Aug 29, 2025 · The primary key is a key that helps uniquely identify the tuple of the database. In contrast, the Foreign Key is a key used to determine the relationship between the tables through the primary key of one table that is the primary key of one table acts as a foreign key to another table. Nov 18, 2025 · Learn about primary and foreign key constraints, important objects used to enforce data integrity in database tables. Learn the difference between primary key and foreign key in SQL with visual diagrams, code examples, and practical detective-themed scenarios.
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