Describe the Reason Why It Is Acceptable to Have Null

question 6

Essay

Describe the reason why it is acceptable to have null foreign key,but it is unacceptable to have a null primary key.Use the concept of entity integrity rule and referential integrity rule in your answer.

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Definitions:

Wartime Economy

An economic phase in which a country's economy is significantly influenced or dominated by the demands of war production, often leading to rapid changes in manufacturing and labor.

Wartime Revenue Acts

A series of laws enacted to increase federal revenue to fund military operations during times of war, often involving taxes on income, profits, or goods.

Income Tax

A tax levied by the government directly on individuals' or entities' income.

Labor Force

The total number of people, both employed and unemployed, who are actively looking for work.