Multiple choice technology databases

Which constraint can be defined only at the column level?

  1. UNIQUE

  2. NOT NULL

  3. CHECK

  4. PRIMARY KEY

  5. FOREIGN KEY
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B Correct answer
Explanation

The NOT NULL constraint must be defined at the column level during table creation. Other constraints like UNIQUE, CHECK, PRIMARY KEY, and FOREIGN KEY can be defined at either the column level or the table level.

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