What Is a Foreign Key

question 253

Multiple Choice

What is a foreign 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:

Developmental Trends

Patterns and sequences of development observed over time, which can include physical, cognitive, and social changes.

Causality

The relationship between cause and effect, where one event (the cause) is understood to lead to another event (the effect) as a result.

Longitudinal Studies

Research designed to observe the same subjects over a period of time, allowing for the study of changes and developments.

Cross-Sectional Studies

Research designs in which subjects of different ages are studied at one point in time.