Question: The foreign key is equal to the candidate key in some row of the primary table, or else has no value (the NULL value.). This rule is called a ______ between the two tables.
Answer:
MCQ: The foreign key is equal to the candidate key in some row of the primary table, or else has no value (the NULL value.). This rule is called a ______ between the two tables.
Correct Answer:
A. referencing integrity constraint
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Related Questions
- 1. ______ should not contain NULL value in its Attribute value.
- 2. An ER diagram can express the overall __________of a database graphically
- 3. Which of the following structure represent the entity sets?
- 4. Ellipses represent_________
- 5. Diamond Represents______
- 6. Which of the following diagram link attributes to entity sets and entity sets to relationship sets?
- 7. Double ellipses represents_____
- 8. Dashed ellipses represents_____
- 9. Double Line indicate_____
- 10. Double Rectangle represent_____
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