Entity integrity constraint States that:
2016
Entity integrity constraint States that:
- A.
the value of the primary key must be unique in all tuples
- B.
the value of the primary key can't be null
- C.
the value of the foreign key can't be null
- D.
a table can't have both primary key and foreign key
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Correct answer: B
Entity integrity constraint states that no primary key value can be null. This ensures that every row in a table can be uniquely identified and tracked, maintaining data accuracy. Therefore, Option B is correct.