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

Question

BlackTom AI · Accepted Answer

The prompt asks about what to create to understand functional dependencies in a database. Since the answer options are not provided, I will focus on the given suggested answer and explain why that choice can be appropriate, while also noting the limitation that we cannot compare it to other options that would normally appear.

Regarding the proposed option: 'dependency graph'. A dependency graph is a visual representation where attributes (or attributes groups) are nodes and directed edges encode functional dependencies between them. Such a diagram helps designers see which attributes depend on others, making it easier to identify redundant data and determine normalization steps. This aligns with the goal of mapping functional dependencies before decomposing relations.

Why this can be correct: first, it translates abstract FD relationships into a tangible structure; second, it supports analysis for closure computations, attribute determination, and identifying keys; third, it helps communicate the dependencies to team members who may grasp visuals more readily than textual FD lists. This makes the dependency graph a sensible tool in the early stages of database design when we need to reveal and reason about dependencies.

Why other options (if they existed) might be incorrect: if an answer suggested a 'data dictionary' alone, while helpful for documenting attributes and types, it does not explicitly encode inter-attribute dependencies in a visual/readable form. If an option proposed 'entity-relationship diagram' without focusing on functional dependencies, it might emphasize relationships between entities rather than the precise FD mappings used for normalization. If an option claimed 'random guesswork' or 'nothing', both would fail to provide a structured approach to understanding FD and would be unsuitable for a design process.

In summary, with the given context, creating a dependency graph is a reasonable approach to capture and analyze functional dependencies, aiding normalization planning, provided other competing options were unavailable for comparison.

25SP-MIS542B-BL-14469 Final Exam

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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