Database Normalization: Master the Art of Data Organization

Question 1

Database normalization offers several benefits. Which of the following options is **NOT** an advantage of data normalization?

Accepted Answer

Increased data inconsistency

Answer

Reduced data redundancy

Answer

Improved data retrieval efficiency

Answer

Increased data complexity

Question 2

Which of the following is **NOT** a benefit of database normalization?

Accepted Answer

Increased data inconsistency

Answer

Reduced data redundancy

Answer

Improved data integrity

Answer

Faster query processing

Question 3

What is the purpose of a functional dependency?

Accepted Answer

To define the relationship between two attributes

Answer

To identify the primary key of a table

Answer

To ensure data integrity

Answer

To improve query performance

Question 4

What is the process of decomposing a table into smaller tables based on functional dependencies called?

Accepted Answer

Normalization

Answer

Denormalization

Answer

Refactoring

Answer

Optimization

Question 5

What is the key difference between 1NF and 2NF?

Accepted Answer

1NF removes repeating groups, while 2NF eliminates partial dependencies.

Answer

1NF eliminates partial dependencies, while 2NF removes repeating groups.

Answer

Both 1NF and 2NF eliminate repeating groups.

Answer

Both 1NF and 2NF eliminate partial dependencies.

Question 6

In the context of relational databases, what is the primary purpose of a foreign key?

Accepted Answer

To establish a meaningful relationship between two tables.

Answer

To ensure that data can only be entered once.

Answer

To speed up data retrieval by indexing the data.

Answer

To count the number of rows in a table.

Question 7

Which of the following is NOT a recognized benefit of database normalization?

Accepted Answer

Increased data complexity.

Answer

Reduced data redundancy.

Answer

Enhanced data integrity.

Answer

Faster data retrieval.

Question 8

What is the minimum normal form requirement for a database to be considered well-structured?

Accepted Answer

First Normal Form (1NF)

Answer

Second Normal Form (2NF)

Answer

Third Normal Form (3NF)

Answer

Boyce-Codd Normal Form (BCNF)

Question 9

What is the process of verifying whether a database meets a specific normal form called?

Accepted Answer

Normalization validation.

Answer

Database inspection.

Answer

Schema testing.

Answer

Data assessment.

Question 10

Which of the following tools is commonly used to visualize and analyze database schemas for normalization purposes?

Accepted Answer

Entity-Relationship diagram (ER diagram).

Answer

Flowchart.

Answer

Spreadsheet.

Answer

Code editor.

Question 11

How do the requirements of 1NF, 2NF, and 3NF differ?

Accepted Answer

1NF: No repeating groups, 2NF: No partial dependency, 3NF: No transitive dependency

Answer

1NF: Atomic values, 2NF: No duplicate rows, 3NF: No non-key attributes

Answer

1NF: Primary key constraints, 2NF: No data updates, 3NF: Optimized query performance

Answer

1NF: No duplicate rows, 2NF: No partial dependency, 3NF: Data consistency

Question 12

In a non-normalized relation, Customers(customer_id, customer_name, orders), which anomaly arises when you add a new customer without an associated order?

Accepted Answer

Insertion anomaly

Answer

Deletion anomaly

Answer

Modification anomaly

Question 13

What is the purpose of a primary key in the context of database normalization?

Accepted Answer

To ensure that each row in a table is unique.

Answer

To specify the type of data stored in a column.

Answer

To establish relationships between tables.

Answer

To store frequently accessed data for faster retrieval.

Question 14

What is a 'candidate key' in the context of database normalization?

Accepted Answer

A field or combination of fields that can uniquely identify a row in a table.

Answer

A field that is used to sort the data in a table.

Answer

A field that is used to establish relationships between tables.

Answer

A field that is used to store frequently accessed data.

Question 15

What is the difference between 2NF and 3NF?

Accepted Answer

2NF ensures that there are no partial dependencies, while 3NF ensures that there are no transitive dependencies.

Answer

3NF ensures that there are no partial dependencies, while 2NF ensures that there are no transitive dependencies.

Answer

2NF and 3NF are the same normal form.

Answer

2NF is a higher normal form than 3NF.

Question 16

Which of the following is NOT a benefit of normalization?

Accepted Answer

Increased data redundancy

Answer

Improved data integrity

Answer

Reduced data inconsistency

Answer

Simplified data updates

Question 17

A relation is in First Normal Form (1NF) if:

Accepted Answer

It has no repeating groups of data (atomic values only)

Answer

Its attributes are all atomic

Answer

It has a composite primary key

Answer

It has no transitive dependencies

Question 18

Which of the following is a violation of Second Normal Form (2NF)?

Accepted Answer

A non-key attribute is dependent on only part of the primary key

Answer

A non-key attribute is dependent on the primary key

Answer

A composite primary key is used

Question 19

Which of the following normal forms is considered the highest level of normalization?

Accepted Answer

Boyce-Codd Normal Form (BCNF)

Answer

Second Normal Form (2NF)

Answer

First Normal Form (1NF)

Question 20

In a database, a functional dependency is a relationship between:

Accepted Answer

Attributes

Answer

Tables

Answer

Rows

Answer

Columns

Question 21

Which of the following is a technique used to decompose relations into smaller, more manageable tables?

Accepted Answer

Normalization

Answer

Denormalization

Answer

Aggregation

Answer

Generalization

Question 22

A transitive dependency occurs when:

Accepted Answer

Attribute A determines Attribute B, and Attribute B determines Attribute C

Answer

Attribute A and Attribute B are both determined by Attribute C

Answer

Attribute A determines Attribute B, and Attribute C determines Attribute A

Question 23

Which of the following is a potential drawback of normalization?

Accepted Answer

Increased processing time for queries

Answer

Improved data security

Answer

Reduced storage space

Answer

Simplified data maintenance

Question 24

In a database schema, a primary key is used to:

Accepted Answer

Uniquely identify each row in a table

Answer

Enforce referential integrity between tables

Answer

Ensure that all attributes in a relation are atomic

Answer

Prevent duplicate rows from being inserted into a table

Question 25

Which of the following is NOT a guideline for effective normalization?

Accepted Answer

Normalize all tables to the highest possible normal form

Answer

Consider the specific requirements of the database application

Answer

Identify and eliminate all functional dependencies