The FOREIGN KEY constraint is used to link two tables together.
It creates a relationship between parent and child tables.
This ensures referential integrity.
A foreign key in one table refers to the primary key of another table.
This connection maintains data consistency.
The parent table contains the primary key.
The child table contains the foreign key.
This relationship prevents invalid data.
The foreign key ensures that referenced values exist.
It prevents orphan records.
This is essential for relational databases.
FOREIGN KEY maintains relationships between tables.
It improves data integrity.
Understanding foreign keys is mandatory for backend developers.