Which of the following constraints enforces that the value of the primary key…
2017
Which of the following constraints enforces that the value of the primary key cannot be Null?
Answer: D. Entity integrity constraint — The correct option is D: Entity integrity constraint. The entity integrity constraint is a fundamental rule in the relational database model which strictly…
- A.
Key constraint
- B.
Foreign key constraint
- C.
Domain constraint
- D.
Entity integrity constraint
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Correct answer: D
The correct option is D: Entity integrity constraint. The entity integrity constraint is a fundamental rule in the relational database model which strictly states that no primary key value can be NULL. This ensures that every row in a table can be uniquely identified.
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