Primary and foreign keys are both essential components of relational databases. They provide the structure for data organization and ensure data integrity. This article will discuss the differences between primary and foreign keys, their purpose and how they are used in database design.
About Difference Between Primary Key And Foreign Key
| Primary Key | Foreign Key |
|---|---|
| Unique identifier of a record | Refers to primary key in another table |
| Identifies each row uniquely | Creates relationship between tables |
| Cannot accept null values | Can accept null values |
| Only one per table | Multiple per table possible |
| Values can't be changed | Values can be updated |
| Used for retrieval and identification | Used for establishing relationships |
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