The process of Normalization is primarily about:

Question

BlackTom AI · Accepted Answer

Normalization organizes a table so it represents a single fact or entity, minimizing redundancy and preventing update/insert/delete anomalies.

1) Relevant concepts: relational schema design, redundancy, functional dependency, and the normal forms (1NF, 2NF, 3NF, BCNF). Functional dependency means one set of attributes determines another. Redundancy and improper dependencies cause anomalies: e.g., repeating groups, partial dependencies (non-key attributes depending on part of a composite key), and transitive dependencies (A → B → C). Normalization applies rules to eliminate those problematic dependencies.

2) Step-by-step reasoning:
- First normal form (1NF) requires atomic values and a unique row identifier. This prevents repeating groups and forces each column to hold one value.
- Second normal form (2NF) removes partial dependencies: if a non-key attribute depends only on part of a composite primary key, move it to its own table. This separates different concepts into separate tables.
- Third normal form (3NF) removes transitive dependencies: if A → B and B → C, ensure C is stored with B (or in its own table) so non-key attributes depend only on the key.
- BCNF tightens the rule: every determinant must be a candidate key.
These steps result in tables that each "keep track of only one thing" (one entity type or one relationship), with clear keys and minimal duplication.

3) (No numerical calculations.)

4) Why the correct answer is correct: The core goal of normalization is to decompose a schema so each table captures a single subject and its attributes, ensuring dependencies are appropriate and redundancy is reduced. That is exactly "making sure each table is keeping track of only one thing."

5) Why other options are incorrect:
- "Each table is a relation": true in relational theory but not the primary purpose of normalization; it’s a model requirement, not the normalization goal.
- "Increasing the functional dependencies present": normalization aims to manage/reduce undesirable dependencies, not increase them.
- "Keeping database tables consistent with spreadsheet practices": spreadsheets have different design concerns; normalization is specific to relational integrity and avoiding redundancy.

Conclusion: The correct answer is "Making sure each table is keeping track of only one thing."

The process of Normalization is primarily about:单项选择题

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Which of the following is NOT something normalization is trying to do?

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