You are analyzing an existing relational database. Which feature is specifically responsible for enforcing referential integrity between two tables?
Stored procedure
Clustered index
Foreign key constraint
Primary key constraint
In a relational database, a foreign key constraint links a column (or set of columns) in one table to the primary key of another table. This relationship ensures that any value inserted in the child table must first exist in the parent table, thereby maintaining referential integrity. A primary key uniquely identifies rows within its own table but does not enforce relationships across tables. Indexes improve query performance but do not guarantee integrity. Stored procedures contain executable code and likewise do not enforce referential rules automatically.
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