What is the nature of functional dependencies (FDs) in relation to database states? A) FDs can be inferred from any given state. B) FDs are properties of specific relation states.... What is the nature of functional dependencies (FDs) in relation to database states? A) FDs can be inferred from any given state. B) FDs are properties of specific relation states. C) FDs can change dynamically based on state data. D) FDs are properties of relation schemas.
Understand the Problem
The question is asking about the characteristics of functional dependencies (FDs) in the context of database states and requires us to identify the correct statement among the given options.
Answer
FDs are properties of relation schemas.
The final answer is D) FDs are properties of relation schemas.
Answer for screen readers
The final answer is D) FDs are properties of relation schemas.
More Information
Functional dependencies (FDs) describe how one set of attributes determines another set in a relational database schema. They don't depend on the state of the data but are intrinsic to the schema. This means FDs are static with respect to the schema and don't change with data state.
Tips
A common mistake is to think that FDs depend on current data rather than the schema. FDs are designed to be independent of the data state to ensure data integrity and normalization based on schema design.
Sources
- Functional dependencies question in relational database design - stackoverflow.com
- Why can we not infer a functional dependency automatically - Vaia - vaia.com
- Chapter 11 Functional Dependencies – Database Design - opentextbc.ca
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