The UNIQUE Constraint Differs from the PRIMARY KEY Constraint in What

question 4

Multiple Choice

The UNIQUE constraint differs from the PRIMARY KEY constraint in what way?​

• A) ​The UNIQUE constraint does not allow NULL values.
• B) ​The UNIQUE constraint can be created at either the column level or the table level.
• C) ​The UNIQUE constraint allows NULL values.
• D) ​The UNIQUE constraint ensures that a specific condition is true before a data value is added to a table.

---

Definitions:

Real Assets

Physical or tangible assets such as real estate, commodities, or natural resources that have intrinsic value.

Production Equipment

Machinery and tools that are used in the manufacturing process to create products and goods.

Bonds

Fixed-income instruments that represent a loan made by an investor to a borrower, typically corporate or governmental, which pay periodic interest payments and repay the principal at maturity.

Financial Assets

Assets that derive value from a contractual claim, such as stocks, bonds, bank deposits, and other securities.