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  • Which constraint can be defined only at the column level?
Multiple choice

Which constraint can be defined only at the column level?

  1. UNIQUE

  2. NOT NULL

  3. CHECK

  4. PRIMARY KEY

  5. FOREIGN KEY

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

NOT NULL constraint restricts a column from having a NULL value. Once NOT NULL constraint is applied to a column, you cannot pass a null value to that column.

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