Master Relational Data Modeling: Tables, Constraints, and Integrity

Question 1

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

Accepted Answer

Fields

Answer

Tables

Answer

Rows

Answer

Columns

Question 2

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

Accepted Answer

To uniquely identify each row in a table

Answer

To enforce referential integrity

Answer

To provide a unique name for the table

Answer

To store the data values for a row

Question 3

What is the key distinction between a weak entity and a strong entity in the Relational Data Model?

Accepted Answer

Weak entities do not possess their own primary key, whereas strong entities do.

Answer

Strong entities can have multiple primary keys, while weak entities have only one.

Answer

Weak entities are inherently dependent on strong entities, while strong entities can exist independently.

Answer

There is no fundamental difference between weak and strong entities.

Question 4

Which of the following is NOT a recognized advantage of using the Relational Data Model?

Accepted Answer

Increased data complexity

Answer

Enhanced data independence

Answer

Reduced data redundancy

Answer

Improved data integrity

Question 5

Which data type is most appropriate for defining a primary key in a relational database?

Accepted Answer

Integer

Answer

String

Answer

Boolean

Answer

Date

Question 6

What is the primary objective of using normalization in a relational database?

Accepted Answer

To reduce data redundancy and enhance data integrity

Answer

To increase data complexity and storage requirements

Answer

To create relationships between tables

Answer

To enforce referential integrity

Question 7

Within the Relational Data Model, what data structure is used to represent a collection of related data items?

Accepted Answer

Table

Answer

Row

Answer

Column

Answer

Key

Question 8

Which data integrity constraint maintains consistency by ensuring values in a foreign key column match corresponding values in another table's primary key column?

Accepted Answer

Referential integrity

Answer

Unique constraint

Answer

Foreign key constraint

Answer

Candidate key constraint

Question 9

Which data integrity constraint prevents duplicate values from being entered into a column?

Accepted Answer

Unique constraint

Answer

Referential integrity

Answer

Foreign key constraint

Answer

Candidate key constraint

Question 10

Explain the distinction between a candidate key and a primary key.

Accepted Answer

A candidate key is a potential primary key, whereas a primary key is the chosen unique identifier.

Answer

They are interchangeable concepts.

Answer

A primary key is a potential candidate key, whereas a candidate key is the designated unique identifier.

Answer

Candidate keys are always unique, while primary keys are not.

Question 11

Which characteristic is not associated with the Relational Data Model?

Accepted Answer

Hierarchical structure

Answer

Rows and columns

Answer

Tables

Answer

Primary keys

Question 12

What is the primary purpose of foreign keys in the Relational Data Model?

Accepted Answer

Enforcing referential integrity

Answer

Establishing relationships between tables

Answer

Ensuring data consistency

Answer

Identifying unique rows

Question 13

Which data type is appropriate for storing dates in a relational database?

Accepted Answer

DATE

Answer

INTEGER

Answer

VARCHAR

Answer

BOOLEAN

Question 14

What is the term for a group of database operations treated as a single unit of work?

Accepted Answer

Transaction

Answer

Query

Answer

View

Answer

Index

Question 15

What is the main purpose of data integrity constraints in a relational database?

Accepted Answer

Preventing data inconsistencies and ensuring data referential integrity.

Answer

Improving database performance and optimizing query execution speed.

Answer

Simplifying data entry and making it more user-friendly.

Answer

Enhancing data security and protecting against unauthorized access.

Question 16

In a relational data model, what are the three main components and how do they relate to each other?

Accepted Answer

Tables hold data in rows and columns, rows represent individual records, and columns represent attributes or fields.

Answer

Rows hold data in columns and tables, columns represent individual records, and tables represent attributes or fields.

Answer

Columns hold data in rows and tables, tables represent individual records, and rows represent attributes or fields.

Question 17

What are the two essential characteristics of an effective primary key in a database table?

Accepted Answer

Uniqueness and non-null values

Answer

Brevity and memorability

Answer

Referential integrity with other tables

Answer

Automated value generation

Question 18

When designing a relational database for an e-commerce website, it is important to consider which factors when defining the relationships between tables?

Accepted Answer

Data cardinality and constraints

Answer

Data types only

Answer

Table names only

Answer

Primary keys only

Question 19

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

Accepted Answer

Entity

Answer

Row

Answer

Column

Answer

Table

Question 20

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

Accepted Answer

To uniquely identify each record in a table

Answer

To enforce data integrity

Answer

To establish relationships between tables

Question 21

Which data integrity constraint is used to prevent duplicate values in a column?

Accepted Answer

UNIQUE

Answer

FOREIGN KEY

Answer

NOT NULL

Answer

PRIMARY KEY

Question 22

Describe the relationship between a foreign key and a primary key in a relational database.

Accepted Answer

A foreign key in one table references the primary key in another table, establishing a parent-child relationship.

Answer

They are always in the same table.

Answer

The primary key in one table references the foreign key in another table.

Question 23

Explain the distinction between a table and a view in a relational database.

Accepted Answer

A table stores actual data, while a view is a virtual table that presents data from one or more underlying tables without storing its own data.

Answer

A view can be updated, while a table cannot.

Question 24

What is the main benefit of using an index in a relational database?

Accepted Answer

To enhance data retrieval performance by providing a faster way to locate specific records.

Answer

To enforce data integrity

Answer

To store duplicate data

Answer

To create relationships between tables