Discussion
The phrase "SALE.CNumber must exist in CUSTOMER.CNumber" is a referential integrity constraint.
Answer: A
Correct answer: True
A referential integrity constraint requires that every value appearing in a foreign key already exist as a key value in the referenced relation, which is exactly what this phrase states. It is enforced by the database rather than by the application, and it is what prevents a sale from referring to a customer who does not exist.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development