Relational Data Model: Master the Fundamentals for Database Systems

Question 1

In the 'Customers' table, which attribute uniquely identifies each customer?

Accepted Answer

Customer ID

Answer

First Name

Answer

Last Name

Answer

Email Address

Question 2

When storing a customer's phone number, which data type ensures its integrity by preventing invalid characters?

Accepted Answer

CHAR(10)

Answer

INTEGER

Answer

VARCHAR(10)

Answer

TEXT

Question 3

To prevent null values in a specific field, which constraint should be applied?

Accepted Answer

NOT NULL

Answer

UNIQUE

Answer

PRIMARY KEY

Answer

CHECK

Question 4

Which SQL command is used to select specific data from a database table?

Accepted Answer

SELECT

Answer

INSERT

Answer

UPDATE

Answer

DELETE

Question 5

To merge rows from two tables based on a specified condition, which type of join operation is used?

Accepted Answer

Inner Join

Answer

Outer Join

Answer

Cross Join

Answer

Union Join

Question 6

In a relational query, which clause is used to group data based on common attributes?

Accepted Answer

GROUP BY

Answer

HAVING

Answer

ORDER BY

Answer

WHERE

Question 7

Which database normalization form guarantees that all attributes depend solely on the primary key, eliminating partial dependencies?

Accepted Answer

BCNF

Answer

1NF

Answer

2NF

Answer

3NF

Question 8

Among the ACID properties, which one ensures that a transaction is either fully executed or not executed at all?

Accepted Answer

Atomicity

Answer

Consistency

Answer

Isolation

Answer

Durability

Question 9

Which data modeling technique is commonly employed to depict intricate relationships between entities?

Accepted Answer

Entity-Relationship Modeling

Answer

Object-Oriented Modeling

Answer

Use Case Modeling

Answer

Data Flow Diagramming

Question 10

Within a relational database, which constraint type ensures a foreign key in a child table references an existing primary key in the parent table?

Accepted Answer

Foreign key

Answer

Unique

Answer

Primary key

Answer

Not null

Question 11

Which characteristic is NOT applicable to the relational data model?

Accepted Answer

Duplicate rows permissible within tables

Answer

Data organization into tables

Answer

Key-based representation of relationships between tables

Answer

SQL as the primary data access method

Question 12

What is the primary purpose of defining a primary key in a relational database?

Accepted Answer

Guaranteeing unique identification of each row within a table

Answer

Enhancing data integrity

Answer

Optimizing query execution speed

Answer

Facilitating table joins

Question 13

Which of the following is NOT a type of join operation in SQL?

Accepted Answer

UNION JOIN

Answer

INNER JOIN

Answer

LEFT JOIN

Answer

RIGHT JOIN

Question 14

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

Accepted Answer

To enhance query performance

Answer

To enforce referential integrity

Answer

To reduce data redundancy

Answer

To facilitate data manipulation

Question 15

Which of the following is NOT a fundamental component of the Relational Data Model?

Accepted Answer

Objects

Answer

Tables

Answer

Columns

Answer

Keys

Question 16

What type of key uniquely identifies each row in a database table?

Accepted Answer

Primary key

Answer

Foreign key

Answer

Candidate key

Answer

Super key

Question 17

Which constraint is used to prevent null values in a column?

Accepted Answer

NOT NULL

Answer

UNIQUE

Answer

DEFAULT

Answer

CHECK

Question 18

What is the main purpose of a foreign key in a relational database?

Accepted Answer

To enforce data integrity by preventing orphaned records

Answer

To establish a relationship between tables

Answer

To ensure that data is unique across multiple tables

Answer

To optimize data retrieval

Question 19

Which type of relationship in the Relational Data Model represents a one-to-one correspondence between rows?

Accepted Answer

One-to-one

Answer

One-to-many

Answer

Many-to-one

Answer

Many-to-many

Question 20

What is the specific purpose of a CHECK constraint?

Accepted Answer

To ensure that data in a column meets a specified condition

Answer

To prevent duplicate values in a column

Answer

To enforce data integrity by maintaining relationships between tables

Answer

To optimize query performance

Question 21

The primary purpose of normalization in relational databases is to:

Accepted Answer

Reduce data redundancy and enhance data integrity

Answer

Optimize query efficiency

Answer

Prepare data for machine learning

Answer

Facilitate data migration

Question 22

What is database normalization, and how does it contribute to efficient data management?

Accepted Answer

Normalization is the process of structuring data in a database to reduce redundancy and improve data integrity.

Answer

Normalization solely involves assigning unique identifiers to each record in the database.

Answer

Normalization is primarily relevant for large databases and offers no benefits for small databases.

Answer

Normalization can potentially increase data redundancy in a database.

Question 23

How does data validation ensure data integrity in relational database models?

Accepted Answer

Ensures data entered meets specified criteria and constraints.

Answer

Automatically corrects data entry errors.

Answer

Prevents duplicate data entry.

Answer

Enhances database query performance.

Question 24

Which of the following is NOT a defining characteristic of the Relational Data Model?

Accepted Answer

Data can be stored in any arbitrary format

Answer

Data is organized into structured tables

Answer

Data integrity is maintained through key relationships

Answer

Tables are the primary data structure

Question 25

In a relational database, the primary role of a primary key is to:

Accepted Answer

Uniquely identify each row within a table

Answer

Enforce referential integrity between tables

Answer

Group related data together

Answer

Speed up data retrieval through indexing

Question 26

Which of the following relationship types is NOT supported in the Relational Data Model?

Accepted Answer

Many-to-only-one

Answer

One-to-one

Answer

One-to-many

Answer

Many-to-many

Question 27

In the Relational Data Model, a foreign key serves the primary purpose of:

Accepted Answer

Enforcing referential integrity between tables

Answer

Identifying the primary key of a related table

Answer

Grouping related data

Answer

Optimizing data retrieval

Question 28

Constraints in a relational database are primarily used to:

Accepted Answer

Ensure data accuracy and consistency

Answer

Enhance performance

Answer

Simplify database management

Answer

Prevent unauthorized access

Question 29

The primary objective of database normalization is to:

Accepted Answer

Eliminate data redundancy and enhance data integrity

Answer

Improve query efficiency

Answer

Simplify database management

Answer

Prevent unauthorized access

Question 30

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

Accepted Answer

To speed up data retrieval by organizing data in a specific order.

Answer

To prevent unauthorized access to sensitive data.

Answer

To ensure the accuracy and consistency of stored data.

Answer

To make the database easier to manage and maintain.

Question 31

In the Relational Data Model, what is the primary function of a primary key?

Accepted Answer

To uniquely identify each row in a table.

Answer

To ensure data integrity by preventing duplicate values in a column.

Answer

To establish relationships with other tables using foreign keys.

Answer

To restrict values in a column to a predefined set of values.

Question 32

What type of key uniquely identifies each row within a table?

Accepted Answer

Primary key

Answer

Candidate key

Answer

Foreign key

Answer

Unique key

Question 33

Which constraint is used to enforce referential integrity, ensuring that a foreign key value references a valid row in another table?

Accepted Answer

REFERENCES constraint

Answer

NOT NULL constraint

Answer

UNIQUE constraint

Answer

CHECK constraint

Question 34

What is the primary function of a database trigger?

Accepted Answer

Both (a) and (c).

Answer

To automatically execute specific actions based on predefined events.

Answer

To monitor changes to the database and alert administrators.

Answer

To enforce business rules and maintain data integrity.

Question 35

Which data type is most appropriate for storing dates and times in a database?

Accepted Answer

Timestamp

Answer

Integer

Answer

String

Answer

Date

Question 36

Which data integrity constraint ensures that all values in a column are unique, excluding null values?

Accepted Answer

UNIQUE

Answer

NOT NULL

Answer

DEFAULT

Answer

PRIMARY KEY

Question 37

Which characteristic is NOT desirable in a well-structured relational schema?

Accepted Answer

Facilitated data updates

Answer

Minimized data redundancy

Answer

Enforced data integrity

Answer

Optimized query performance

Question 38

Which SQL statement is used to retrieve data from a relational database table?

Accepted Answer

SELECT

Answer

INSERT

Answer

UPDATE

Answer

DELETE

Question 39

Which data type should be used to store dates in a relational database?

Accepted Answer

DATE

Answer

INTEGER

Answer

VARCHAR

Answer

FLOAT

Question 40

Which operation is used to merge data from multiple tables in a relational database based on shared attributes?

Accepted Answer

Join

Answer

Union

Answer

Intersection

Answer

Difference

Question 41

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

Accepted Answer

To uniquely identify each record

Answer

To ensure data integrity

Answer

To enforce relationships between tables

Answer

To store additional information about a record

Question 42

Which type of constraint specifies that a column cannot contain null values?

Accepted Answer

NOT NULL

Answer

UNIQUE

Answer

PRIMARY KEY

Answer

FOREIGN KEY

Question 43

What is the distinction between a 1:1 and a 1:M relationship between two tables?

Accepted Answer

1:1 indicates a one-to-one relationship, while 1:M indicates a one-to-many relationship

Answer

1:1 indicates a one-to-many relationship, while 1:M indicates a one-to-one relationship

Answer

Both represent one-to-many relationships

Answer

Both represent one-to-one relationships

Question 44

What is the main purpose of a foreign key in a relational database table?

Accepted Answer

To enforce referential integrity

Answer

To identify the primary key of a related table

Answer

To store additional information about a related record

Answer

To create a relationship between two tables

Question 45

Which of the following is not a valid data type supported by the Relational Data Model?

Accepted Answer

List

Answer

Integer

Answer

String

Answer

Boolean

Question 46

What is the main benefit of using a database index?

Accepted Answer

Improved query performance

Answer

Ensured data integrity

Answer

Reduced data redundancy

Answer

Increased data consistency

Question 47

Which of the following is NOT a defining characteristic of the Relational Data Model?

Accepted Answer

Flat file storage

Answer

Data normalization

Answer

Data integrity

Answer

Declarative query language

Question 48

What is the primary key of a table?

Accepted Answer

A unique identifier for each row

Answer

A column used for sorting the table

Answer

A non-null column

Answer

A foreign key referencing another table

Question 49

What is the primary purpose of a foreign key?

Accepted Answer

To enforce referential integrity

Answer

To store additional information about referenced rows

Answer

To create a unique index

Question 50

Which of the following is a data integrity constraint?

Accepted Answer

NOT NULL

Answer

BETWEEN

Answer

IN

Answer

ORDER BY

Question 51

What is the primary purpose of a declarative query language?

Accepted Answer

To retrieve data from a database using a high-level language

Answer

To create and modify database structures

Answer

To control user access to a database

Question 52

Which of the following is a normalization form?

Accepted Answer

First normal form

Answer

Stemming

Answer

Tokenization

Answer

Clustering

Question 53

What is the primary objective of database normalization?

Accepted Answer

To eliminate data redundancy and anomalies

Answer

To facilitate database maintenance

Answer

To improve query performance

Answer

To enhance data security