Computer Science · Database Management Systems
Which of the following statements are correct regarding the characteristics and null-allowance rules of keys in a relational model? A. A Super Key uniquely identifies a tuple and may contain redundant attributes. B. A Candidate Key is a minimal super key that does not allow NULL values. C. A relational table can have multiple Primary Keys but exactly one Candidate Key. D. A Foreign Key enforces referential integrity, and its value must either match an existing Primary Key value or be NULL. Choose the most appropriate answer from the options given below:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A, B, and D Only✓
- 2A, C, and D Only
- 3B, C, and D Only
- 4A, B, and C Only
Correct answer
A, B, and D Only
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