Relational model: In the relational model, data are organized in tables, which consist of rows and columns. A data in a row or column of a table are called fields. Fields in a database table are also referred as attributes of a database object. A group of related fields are called as a record, which is also called as database object or entity. A group of records are called a table. Keys in a relational database table refer to a key field. To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique. Therefore, key field is used to identify the unique record from a collection of records. For example, Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records. The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

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Answer 1

Question

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

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Write a FancyCar class to support basic operations such as drive, add gas, honk horn, and start engine. FancyCar.java is provided with method stubs. Follow each step to gradually complete all methods. Note: This program is designed for incremental development. Complete each step and submit for grading before starting the next step. Only a portion of tests pass after each step but confirm progress. The main() method includes basic method calls. Add statements in main() as methods are completed to support development mode testing. Step 0. Declare private fields for miles driven as shown on the odometer (int), gallons of gas in tank (double), miles per gallon or MPG (double), driving capacity (double), and car model (String). Note the provided final variable indicates the gas tank capacity of 14.0 gallons. Step 1 (2 pts). 1) Complete the default constructor by initializing the odometer to five miles, tank is full of gas, miles per gallon is 24.0, and the model is "Old Clunker". 2)…

Find the error: daily_sales = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] days_of_week = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'] for i in range(7): daily_sales[i] = float(input('Enter the sales for ' \ + day_of_week[i] + ': ')

Find the error: daily_sales = [0.0, 0,0, 0.0, 0.0, 0.0, 0.0, 0.0] days_of_week = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'] for i in range(7): daily_sales[i] = float(input('Enter the sales for ' \ + days_of_week[i] + ': ')

Answer 2

Question

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Question

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

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Answer 4

Question

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

Answer 6

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

Answer 7

Chapter 2, Problem 2.1RQ

Program Plan Intro

Relational model:

In the relational model, data are organized in tables, which consist of rows and columns.

A data in a row or column of a table are called fields.

Fields in a database table are also referred as attributes of a database object.

A group of related fields are called as a record, which is also called as database object or entity.

A group of records are called a table.

Keys in a relational database table refer to a key field.

To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.

Therefore, key field is used to identify the unique record from a collection of records.

For example,

Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.

The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.

Answer 8

Expert Solution & Answer

Explanation of Solution

Importance of relational model:

Relational model is important, due to the following reasons

It is important because it acts as the universal model to store the data in computers and it can be easily available.
Specific values can be easily accessed through a database.
It can be used for the designing and implementation of commercial database.
Its data storage capacity can be extended and it won’t depend on physical organization.
It includes the Structured Query Language (SQL).
It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Ch. 2 - Prob. 2.1RQ Ch. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQ Ch. 2 - Prob. 2.4RQ Ch. 2 - Prob. 2.5RQ Ch. 2 - Prob. 2.6RQ Ch. 2 - Prob. 2.7RQ Ch. 2 - Prob. 2.8RQ Ch. 2 - Prob. 2.9RQ Ch. 2 - Define the term unique key and give an example.

Explanation of Solution

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Chapter 2 Solutions