The entity integrity rule states that: Options: A . &nbspno primary key attribute may be null. B . &nbspno primary key can be composite. C . &nbspno primary key may be unique. D . &nbspno primary key may be equal to a value in a foreign key.

The entity integrity rule states that:

Question

The entity integrity rule states that:

Options:

A . no primary key attribute may be null.

B . no primary key can be composite.

C . no primary key may be unique.

D . no primary key may be equal to a value in a foreign key.

Answer: Option A

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Question 1. When mapping a many-to-many unary relationship into a relation which of the following is true?....

Question 2. If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal ....a relation, then the relation is in what normal form?

Question 3. A foreign key is which of the following?....

Question 4. A transitive dependency is which of the following?....

Question 5. When mapping a multivalued attribute into a relation which of the following is true?....

Question 6. A primary key is which of the following?....

Question 7. If no multivalued attributes exist in a relation, then the relation is in what normal form?....

Question 8. When mapping a binary many-to-many relationship into a relation which of the following is true?....

Question 9. The relational model consists of:....

Question 10. A relation has which of the following properties?....

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