Which database constraint prevents duplicate values in a specified column?
Options
- A. CHECK
- B. DEFAULT
- C. UNIQUE
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
C. UNIQUE
Detailed Explanation
- UNIQUE constraint: Ensures that duplicate non-NULL values are not allowed in the constrained column or column combination.
- It helps prevent duplicate entries.
- NULL handling for UNIQUE constraints can vary between DBMS products.