Database Design Quizzes: Test Your Knowledge

Question 1

What is the minimum number of attributes required to uniquely identify an entity in a database?

Accepted Answer

1

Answer

0

Answer

2

Answer

3

Question 2

What differentiates a weak entity from a strong entity?

Accepted Answer

Weak entities lack their own primary key

Answer

Strong entities are dependent on weak entities

Answer

Weak entities have a partial key

Answer

Strong entities can have multiple primary keys

Question 3

In an entity-relationship diagram, which attribute uniquely identifies each entity?

Accepted Answer

Primary key

Answer

Unique identifier

Answer

Identity attribute

Answer

Entity code

Question 4

Which of the following is a database that is not in normal form?

Accepted Answer

Unnormalized form (UNNF)

Answer

First normal form (1NF)

Answer

Second normal form (2NF)

Answer

Third normal form (3NF)

Question 5

Which of the following is **NOT** a key component of an Entity-Relationship Diagram (ERD)?

Accepted Answer

Constraints

Answer

Entities

Answer

Attributes

Answer

Relationships

Question 6

What is the **primary** purpose of normalizing a database?

Accepted Answer

To reduce data redundancy and improve data integrity

Answer

To enhance database performance

Answer

To simplify database design

Answer

To prevent data loss

Question 7

Which of the following normalization forms ensures that each attribute is **atomic** and not further divisible?

Accepted Answer

First Normal Form (1NF)

Answer

Second Normal Form (2NF)

Answer

Third Normal Form (3NF)

Answer

Boyce–Codd Normal Form (BCNF)

Question 8

What is the primary purpose of a primary key?

Accepted Answer

To uniquely identify each record in a table

Answer

To enforce relationships between tables

Answer

To index data for faster retrieval

Answer

To ensure that all data is consistent

Question 9

Which of the following is NOT a characteristic of a well-designed database schema?

Accepted Answer

Redundant

Answer

Normalized

Answer

Consistent

Answer

Efficient

Question 10

Which of the following is the primary characteristic of a primary key?

Accepted Answer

Unique values

Answer

Nullable values

Answer

Foreign key reference

Answer

Indexed for faster retrieval

Question 11

What is the primary purpose of database normalization in a relational database?

Accepted Answer

To reduce data redundancy and improve data integrity

Answer

To enhance query performance

Answer

To simplify database structure

Answer

To reduce storage space

Question 12

Which of the following is NOT a valid type of entity relationship?

Accepted Answer

Many-to-two

Answer

One-to-one

Answer

One-to-many

Answer

Many-to-one

Question 13

What is the key difference between a logical and a physical database design?

Accepted Answer

Logical design focuses on data structure, while physical design focuses on implementation details

Answer

Physical design is more abstract than logical design

Answer

Logical design is temporary, while physical design is permanent

Answer

There is no difference between the two

Question 14

What is the primary purpose of an index in a database?

Accepted Answer

To significantly improve query speed

Answer

To enforce data integrity rules

Answer

To store data in a different format

Answer

To reduce storage space

Question 15

What is the main purpose of a foreign key constraint?

Accepted Answer

To ensure data consistency between related tables

Answer

To prevent duplicate data entries

Answer

To enforce a specific data type

Answer

To create an index on a column

Question 16

What is the main purpose of a data dictionary in database design?

Accepted Answer

To document the database structure, its components, and their relationships

Answer

To store the actual data in the database

Answer

To provide a user interface for accessing the database

Answer

To perform complex data analysis

Question 17

Which of the following is NOT a component of an entity-relationship diagram?

Accepted Answer

Transcript

Answer

Entity

Answer

Relationship

Answer

Attribute

Question 18

What is the main purpose of normalization in database design?

Accepted Answer

To reduce data redundancy and improve data integrity

Answer

To increase the number of tables in a database

Answer

To make the database easier to design

Answer

To improve data access efficiency

Question 19

Which of the following is NOT a benefit of using a database management system?

Accepted Answer

Increased data complexity

Answer

Improved data security

Answer

Reduced data redundancy

Answer

Data sharing and collaboration

Question 20

What is the fundamental difference between a primary key and a foreign key in a database?

Accepted Answer

A primary key uniquely identifies a row in a table, while a foreign key references the primary key in another table.

Answer

A foreign key uniquely identifies a row in a table, while a primary key references the foreign key in another table.

Answer

A primary key is always a numeric value, while a foreign key can be any data type.

Answer

A foreign key is always a numeric value, while a primary key can be any data type.

Question 21

Which of the following is NOT a type of data integrity constraint?

Accepted Answer

DEFAULT

Answer

NOT NULL

Answer

UNIQUE

Answer

CHECK

Question 22

What is the primary purpose of a database query?

Accepted Answer

To retrieve data from a database

Answer

To update data in a database

Answer

To delete data from a database

Answer

To create new tables in a database

Question 23

Which database design principle ensures efficient data storage, minimizing duplication?

Accepted Answer

Normalization

Answer

Entity integrity

Answer

Referential integrity

Answer

Data integrity

Question 24

Which of the following is a core concept in conceptual database design?

Accepted Answer

Entity-relationship modeling

Answer

Data warehousing

Answer

Object-oriented programming

Answer

Relational algebra

Question 25

What is the primary purpose of a primary key in a database table?

Accepted Answer

To uniquely identify each record

Answer

To improve query performance

Answer

To store the most important data

Answer

To enforce referential integrity

Question 26

What is the primary function of a foreign key in database design?

Accepted Answer

To maintain referential integrity between tables

Answer

To enhance query performance

Answer

To uniquely identify records

Answer

To store critical data

Question 27

Which of the following is an example of a data model?

Accepted Answer

Hierarchical

Answer

Word document

Answer

Spreadsheet

Question 28

What is the main objective of data normalization in database design?

Accepted Answer

Eliminating data redundancy and improving data integrity

Answer

Enhancing data retrieval speed

Answer

Simplifying database design

Question 29

Which of the following factors is NOT typically considered during the design phase of a database?

Accepted Answer

The type of hardware used for database storage

Answer

The budget allocated for the project

Answer

The number of anticipated users

Answer

The types of queries expected to be performed

Question 30

Differentiate between weak and strong entities in database design.

Accepted Answer

Weak entities rely on strong entities for their existence, while strong entities can exist independently.

Answer

Weak entities are stored separately, while strong entities are stored together with their parent entities.

Answer

Weak entities have primary keys, while strong entities do not.

Question 31

Which fundamental component of the entity-relationship model represents real-world objects or concepts?

Accepted Answer

Entity

Answer

Relationship

Answer

Table

Answer

Attribute

Question 32

What is the primary purpose of normalization in database design?

Accepted Answer

To eliminate data duplication and ensure data integrity

Answer

To enhance database performance

Answer

To facilitate data recovery

Question 33

Which first normal form (1NF) dependency rule requires each field to contain only atomic values?

Accepted Answer

Atomic values in each field

Answer

No transitive dependencies

Answer

No repeating groups

Answer

No optional fields

Question 34

What is the key difference between a primary key and a foreign key?

Accepted Answer

A primary key uniquely identifies a record, while a foreign key links a record to a related table.

Answer

A foreign key can be null, while a primary key cannot.

Answer

A primary key is longer than a foreign key.

Question 35

What is the primary function of a relational database management system (RDBMS)?

Accepted Answer

To manage and manipulate data stored in relational databases

Answer

To perform statistical analysis

Answer

To create and maintain user interfaces

Question 36

Which advantage is associated with using a graphical user interface (GUI) for database design?

Accepted Answer

Enhanced visualization and user-friendliness

Answer

Faster data processing

Answer

Increased data security

Answer

Reduced storage requirements

Question 37

What is the purpose of a data dictionary in database design?

Accepted Answer

To store metadata and definitions about data

Answer

To manage database security

Answer

To store user data

Question 38

Which of the following is a widely used data modeling technique?

Accepted Answer

Entity-relationship diagram (ERD)

Answer

Flowchart

Answer

Use case diagram

Answer

Decision tree

Question 39

What is the primary objective of database normalization?

Accepted Answer

To create a database structure free from data anomalies and inconsistencies

Answer

To enhance database performance

Answer

To minimize storage space