Identify the Statement Below That Is False with Regards to Basic

question 29

Multiple Choice

Identify the statement below that is false with regards to basic requirements of a relational database model.

• A)Primary keys can be null.
• B)Foreign keys,if not null,must have values that correspond to the value of a primary key in another table.
• C)All non-key attributes in a table should describe a characteristic about the object identified by the primary key.
• D)Every column in a row must be single-valued.

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Definitions:

Interest Forgone

The potential interest one could have earned on their money if it had been invested rather than spent or kept in a non-interest-bearing account.

MC (Marginal Cost)

The additional cost resulting from the production of one more unit of a product or service.

ATC (Average Total Cost)

The total cost of production divided by the quantity of output produced, representing the per-unit cost of production.

MR (Marginal Revenue)

The increment in revenue that results from the sale of one additional unit of a product or service.