# What is a primary key? How do the properties of a primary key differ from those of a candidate key?

QUESTION:

What is the primary key? How do the properties of a primary key differ from those of a candidate key?

That is so great to hear. We really try our best to provide you the quality content. And thank you so much for taking the time to provide your feedback. AnsTutors.com Help-Desk!

## What is a candidate key? How does a candidate key differ from a superkey?

QUESTION: “What is a candidate key? How does a candidate key differ from a superkey?”

## Given R (X, A, Z, B) and A → {B, Z}, what is the candidate key(s) of R?

QUESTION: “Given R (X, A, Z, B) and A → {B, Z}, what is the candidate key(s) of R?”

## A logistic regression model describes how the probability of voting for the Republican candidate

QUESTION: A logistic regression model describes how the probability of voting for the Republican candidate in a presidential election depends on x, the voter’s total…

## What is required to map a relationship type that exhibits a 1:n cardinality ratio?

QUESTION: “What is required to map a relationship type that exhibits a 1:n cardinality ratio?”

## Why does the relation created as result of a Projection operation on a relation that includes the primary key not contain fewer tuples than those in the source relation?

QUESTION: Why does the relation create a result of a Projection operation on a relation that includes the primary key not contain fewer tuples than…

## What is the difference between a key attribute and a non-key attribute?

QUESTION: “What is the difference between a key attribute and a non-key attribute”?

## Why does the relation created as result of a Projection operation on a relation that includes the

QUESTION: Why does the relation create a result of a Projection operation on a relation that includes the primary key not contain fewer tuples than…

## What is the relationship type? How does a relationship type differ from a relationship instance?

QUESTION: What is the relationship type? How does a relationship type differ from a relationship instance?

## How does categorization differ from specialization?

QUESTION: “How does categorization differ from specialization”?

## “How do capital market instruments differ from money market instruments?”

Question: “How do capital market instruments differ from money market instruments?”