Computer Science · Database Management Systems
An instance of a relational schema R(A, B, C) has distinct values for attribute A, which includes NULL values. Which of the following statements is true?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A is a foreign key
- 2A is a primary key
- 3A cannot be a candidate key✓
- 4A is a candidate key
Correct answer
A cannot be a candidate key
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