A primary key is which of the following? Options: A . &nbspAny attribute B . &nbspAn attribute that uniquely identifies each row C . &nbspAn attribute that uniquely identifies each column D . &nbspA derived attribute

A primary key is which of the following?

Question

A primary key is which of the following?

Options:

A . Any attribute

B . An attribute that uniquely identifies each row

C . An attribute that uniquely identifies each column

D . A derived attribute

Answer: Option B

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Question 1. If no multivalued attributes exist in a relation, then the relation is in what normal form?....

Question 2. When mapping a binary many-to-many relationship into a relation which of the following is true?....

Question 3. The relational model consists of:....

Question 4. A relation has which of the following properties?....

Question 5. When mapping a regular entity into a relation which of the following is true?....

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Question 7. Relations are:....

Question 8. When mapping a supertype/subtype relationship which of the following is true?....

Question 9. An enterprise key is a primary key whose value is unique for a given relation.....

Question 10. A composite attribute does not get mapped into a relation.....

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