Foreign Key
N/A
外键
Foreign Key · N/A · 外键 · FOR-in kee · FK · referential integrity · Databases · sql · relations · schemaDatabasesFK referential integrity/FOR-in kee/
Also known as: FK, referential integrity
Last updated August 8, 2026
Definition
A foreign key is a column that references a primary key in another table, enforcing relationships and referential integrity between records.
Real-World Example
An orders table may store customer_id as a foreign key pointing to customers, so every order links to a real customer row.
References
Related terms
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