A primary key should be defined as: Options: A . &nbspNULL. B . &nbspNOT NULL. C . &nbspEither of the above can be used. D . &nbspNone of the above are correct.

A primary key should be defined as:

Question

A primary key should be defined as:

Options:

A . NULL.

B . NOT NULL.

C . Either of the above can be used.

D . None of the above are correct.

Answer: Option B

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Question 2. A foreign key is:....

Question 3. In a 1:1 relationship, the foreign key is placed in:....

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Question 9. Which is not true about surrogate keys?....

Question 10. For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?....

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