Web Reference: The FOREIGN KEY constraint establishes a link between two tables, and prevents action that will destroy the link between them. A FOREIGN KEY is a column in a table that refers to the PRIMARY KEY in another table. Nov 18, 2025 · Learn about primary and foreign key constraints, important objects used to enforce data integrity in database tables. Dec 9, 2025 · A FOREIGN KEY constraint is a concept in SQL that enforces a valid relationship between two tables by ensuring that the values stored in the child table correspond to existing values in the parent table. This constraint protects the database from inconsistent or invalid relational data.
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