Foreign Key
/ˈfɒrɪn kiː/
Definition
A column that references the primary key of another table, enforcing referential integrity between related data.
Example in context
"orders.user_id is a foreign key to users.id — the database rejects orders for non-existent users."
Practice this term
Master Foreign Key in context by working through exercises in the Databases & SQL module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.