Because of the need to know the functional dependencies in a database, it is a good idea to create a(n) ________.

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BlackTom AI · Accepted Answer

In database design, understanding and documenting functional dependencies helps ensure we design appropriate normal forms and constraints. The question asks what to create to capture these dependencies.
Option 1: conceptual schema. A conceptual schema describes high-level entities, attributes, and relationships without getting into the detailed dependencies between attributes. It’s more about the overall data model than the specific functional dependencies, so this choice misses the target.
Option 2: internal schema. The internal schema deals with physical storage structures, access paths, and how data is stored on disk. It involves performance and implementation details, not the formal representation of functional dependencies.
Option 3: dependency graph. A dependency graph (or dependency diagram) is a suitable artifact for representing how attributes functionally depend on one another, which directly addresses the need to know and analyze functional dependencies during design and normalization steps. This option aligns with the purpose described in the question.
Option 4: table-relationship diagram. A table-relationship diagram illustrates tables and their relationships (foreign keys, cardinalities) but does not explicitly capture the formal functional dependencies between attributes. While useful for understanding connections, it isn’t the primary tool for documenting functional dependencies.
Thus, among the choices, the item that best serves the purpose of capturing and communicating functional dependencies is the dependency graph, as it explicitly encodes how attributes depend on each other.

25SP-MIS542B-BL-14469 Chapter 8 Quiz

Because of the need to know the functional dependencies in a database, it is a good idea to create a(n) ________.

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