engineering computer science MCQ #792

Which database constraint ensures that a column contains only unique values?

engineering computer science MCQ #792

  1. Question 1

    Q1. Which database constraint ensures that a column contains only unique values?

    • A) PRIMARY KEY
    • B) UNIQUE
    • C) FOREIGN KEY
    • D) CHECK

    Answer: UNIQUE

    Explanation: UNIQUE constraint ensures that a column contains only unique values, preventing duplicates.