What is the primary purpose of a foreign key in a relational database?
Options
- A. To encrypt data
- B. To maintain referential integrity between related tables
- C. To sort records automatically
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. To maintain referential integrity between related tables
Detailed Explanation
- Foreign key: Establishes a relationship between tables by referencing a candidate key, commonly a primary key.
- Referential integrity: Ensures that references point to valid records, subject to the defined constraints.
- It helps maintain consistency between related tables.