ConceptPrimary Key / 主键（Primary Key）
Primary Key
A field or combination of fields in a database used to uniquely identify each row in a table; it must be non-null, unique and as immutable as possible, and is often referenced by other tables as a foreign key.
Timeline (last 90 days)
Oct 19
Systems that use phone numbers as primary keys may experience identity mismatches in scenarios such as number changes, shared devices, secondary SIM cards, and virtual numbers.
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Oct 19
The core requirements of a primary key are: non-null, unique, and as immutable as possible.
Unverified50%