Primary Key
N/A
主键
Primary Key · N/A · 主键 · PRYE-mair-ee kee · PK · unique key · Databases · sql · schema · identityDatabasesPK unique key/PRYE-mair-ee kee/
Also known as: PK, unique key
Last updated August 8, 2026
Definition
A primary key is a column or set of columns that uniquely identifies each row in a database table and cannot contain duplicates or (usually) nulls.
Real-World Example
In a users table, an auto-incrementing user_id primary key distinguishes two people who share the same name.
References
Related terms
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