A foreign key is a column used to create a relationship between two tables.
It connects data from one table to another table.
Foreign keys maintain consistency between related records.
The foreign key is placed in the child table.
It refers to the primary key of another table.
This connection links related data together.
Foreign keys prevent invalid data from being inserted.
They ensure that referenced data already exists.
This improves data integrity.
The related table stores the foreign key value.
This value matches the primary key of the parent table.
Through this connection, tables remain synchronized.
Foreign keys are essential for relational database design.
They help maintain clean and accurate data.
Most real-world databases rely on foreign key relationships.