Which of the Following States the Rule of Entity Integrity

question 22

Multiple Choice

Which of the following states the Rule of Entity Integrity?

• A) Every row must have a value for the primary key and each value must be unique.
• B) Every foreign key must appear as another table's primary key.
• C) Every row must have a value for the primary key and values may be repeated.
• D) None of the above.

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Definitions:

Nontariff Barriers

Restrictions that countries use to control the amount of trade across their borders, not including the use of tariffs, such as quotas and embargoes.

Competitive Advantage

A condition that allows a company or country to produce goods or services at a lower price or in a more desirable fashion for customers than competitors.

Eurozone

A geographical and economic region consisting of European Union countries that have adopted the euro as their official currency.

EU's Members

Countries that are part of the European Union, an economic and political union of European nations.