Question at position 19 Which of the following is a goal of a normalized relational database?Allow multiple users to access data without securityUse data silosEliminate redundant data by using linksStore all data in a single tableClear my selection

Question

BlackTom AI · Accepted Answer

Normalization aims to eliminate redundant data by organizing a database into tables that represent single topics (entities) and by linking those tables with keys (foreign keys). This reduces update/insert/delete anomalies and improves data integrity and consistency.

1) Relevant concepts
- Normal forms (1NF, 2NF, 3NF, etc.): guidelines for removing repeating groups, partial dependencies, and transitive dependencies.
- Entity separation: put each real-world entity (e.g., Customer, Order, Product) in its own table.
- Foreign keys (links): relate the separate tables to preserve relationships without duplicating data.
- Goal outcomes: minimize redundancy, avoid anomalies, and maintain consistency.

2) Step-by-step reasoning (illustrative example)
- Start with a single Orders table storing CustomerName, CustomerAddress, OrderID, Product, Price. This repeats customer details for every order.
- Identify redundancy: CustomerName and Address repeat across many rows.
- Apply normalization: create a Customer table (CustomerID, CustomerName, Address) and an Order table (OrderID, CustomerID, OrderDate).
- Use a foreign key (CustomerID) in Order to link to Customer. Product details likewise moved to a Product table and an OrderItem table to handle many-to-many relationships.
- Result: customer data is stored once; orders reference customer via links. Redundancy eliminated.

3) Intermediate steps shown above: identify repeating fields → extract into new table → create key columns → replace repeated values with key references.

4) Why the correct answer is correct
- “Eliminate redundant data by using links” directly captures normalization’s purpose: remove duplicate storage by splitting data into related tables and linking them, thereby ensuring consistency and reducing anomalies.

5) Why other options are incorrect
- “Allow multiple users to access data without security”: multi-user access and security are database administration concerns, not normalization goals.
- “Use data silos”: normalization reduces silos; silos are contrary to normalization.
- “Store all data in a single table”: storing everything in one table increases redundancy and violates normalization principles.

6) Conclusion
The correct choice is “Eliminate redundant data by using links,” which matches the provided answer.

Question at position 19 Which of the following is a goal of a normalized relational database?Allow multiple users to access data without securityUse data silosEliminate redundant data by using linksStore all data in a single tableClear my selection单项选择题

类似问题

Question at position 11 Which of the following is a goal of a normalized relational database?Use data silosEliminate redundant data by using linksAllow multiple users to access data without securityStore all data in a single tableClear my selection

Question at position 6 Which of the following is a goal of a normalized relational database?Use data silosAllow multiple users to access data without securityEliminate redundant data by using linksStore all data in a single tableClear my selection

The process of Normalization is primarily about:

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

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单