361 B
361 B
Foreign Key
A Foreign key is a Constraint that protects links between tables. Foreign key is a attribute or attributes that link to the Primary Key of a other entity set (table).
Example
| ID (PK) | Name | Age | Sex | Length |
|---|---|---|---|---|
| 1 | Nick | 21 | M | 190 |
| ID (PK) | Job | Age | Sex | Length |
|---|---|---|---|---|
| 1 | Nick | 21 | M | 190 |