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

A primary key is which of the following?

Question

A primary key is which of the following?

Options:

A . An attribute that uniquely identifies each column

B . A derived attribute

C . An attribute that uniquely identifies each row

D . Any attribute

Answer: Option C

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Question 1. When mapping a multivalued attribute into a relation which of the following is true?....

Question 2. The relational model consists of:....

Question 3. A relation has which of the following properties?....

Question 4. When mapping a regular entity into a relation which of the following is true?....

Question 5. When mapping a ternary relationship with an associative entity into a relation which of the following is true?....

Question 6. When mapping a supertype/subtype relationship which of the following is true?....

Question 7. Relations are:....

Question 8. A primary key may be null.....

Question 9. Weak entities do not get mapped into a relation.....

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

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