A PRIMARY KEY Constraint Can Be Added to an Existing

question 105

Multiple Choice

A PRIMARY KEY constraint can be added to an existing table by using the ____ clause of the ALTER TABLE command.​

• A) ​MODIFY
• B) ​ADD
• C) ​CONSTRAINT
• D) ​none of the above

---

Definitions:

Relative Frequency

The proportion of times a value occurs in relation to the total number of outcomes, often expressed as a percentage.

Categorical Variables

Variables that represent types or categories, where the data can be divided into groups with no inherent numerical ordering.

Percent Frequency

The percentage of times a specific value or range of values occurs within a dataset.

Genetic Differences

Variations in the DNA sequences among individuals or populations, which contribute to the biological diversity and hereditary traits.