engineering computer science MCQ #689

Which database constraint ensures that a column contains unique values?

engineering computer science MCQ #689

  1. Question 1

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

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

    Answer: UNIQUE

    Explanation: The UNIQUE constraint ensures that a column contains unique values, although it can be null.