What Is a Primary Key

question 228

Multiple Choice

What is a primary key?

• A)A field (or group of fields) that uniquely identifies a given entity in a table.
• B)A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables.
• C)Characteristics or properties of an entity.
• D)A field (or group of fields) that uniquely identifies a given attribute in a table.

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Definitions:

Total Revenue

The total amount of money a company receives from selling its goods or services before any expenses are subtracted.

Profit-Maximizing Output

The point of production where a company reaches its maximum profit, occurring when marginal revenue is equal to marginal cost.

Lawn-Mowing

The process of cutting the grass in a lawn to maintain a specified height and appearance.

Short-Run Supply Curve

A graphical representation showing how the quantity supplied varies with price in the short term, when at least one input is fixed.