Multiple choice

Which of the following statement(s) is/are incorrect?

  1. A primary key cannot be NULL.

  2. A foreign key can be NULL.

  3. A foreign key can have the same name as primary key.

  4. A foreign key can have the name other than the primary key.

  5. None of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the right choice as all the above statements are true.

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