The Error Message Index or Primary Key Cannot Contain a Null

question 10

Multiple Choice

The error message Index or primary key cannot contain a Null Value. will be generated by attempting which of the following?

• A) A user tries to enter a record in the table Countries that doesn't contain data in the primary key.
• B) A user tries to add a record to a table that is related to the Countries table, and that record contains a foreign key value that does NOT correspond to a primary key value in the Countries table.
• C) A user tries to enter a record in the table Countries with the same primary key as another record.
• D) A user tries to request a joined table using LINQ.

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Definitions:

State Industries

Industries that are owned, controlled, or heavily regulated by government entities to provide public services or goods.

Central Banks

National institutions tasked with overseeing a country's currency, money supply, and interest rates, and supervising its banking system.

Developing Countries

Nations with relatively lower levels of industrialization, lower standards of living, and often a lower Human Development Index (HDI) compared to developed countries.

Direct Cash Transfers

A form of financial aid where money is given directly to individuals, typically by the government, without any intermediary goods or services.