Computer Science · Database Management Systems
Which of the following best describes the entity integrity constraint in a relational database?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1No two tuples can have duplicate values for a foreign key.
- 2Primary key attributes cannot accept NULL values.✓
- 3A foreign key must match a primary key of another relation.
- 4Attribute values must come from a predefined domain.
Correct answer
Primary key attributes cannot accept NULL values.
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