EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
12th Edition
ISBN: 9781305886841
Author: Morris
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 2, Problem 1RQ
Program Plan Intro
Data Model:
- Data Model refers to the logical inter relationship and the data flow involved between different data elements.
- It defines how data is processed, connected and stored inside the system.
- A data model can be either concrete or abstract.
- It consists of components such as data types, data items, data sources, event sources, and links.
- The three styles of data model are conceptual data model, physical data model, and logical data model.
Expert Solution & Answer
Explanation of Solution
Importance of Data Models:
- The main function of a data model is that they help to understand complexity of real world environment.
- The data model is used by the
database designer to enhance the interaction among designers, application programmers, and end users. - Data models will help to represent the required data and the format that is used for different businesses processes.
- They help to prevent data redundancy.
- The database design tools have made the development of data models to possibly diminish the database design error potential.
- It also helps to eliminate the discrepancies between the database designs components and the real world data environment.
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Students have asked these similar questions
this module is java 731 , follow all instructions and make sure the outputs are like what they expect and make sure the code is 100% correct . include all comments , layout and structure to be perfect too, thanks.
Question 1:
E-Hailing Bicycle Management System
Case Study:An e-hailing company that rents out bicycles needs a system to manage its bicycles, users, and borrowing process. Each user can borrow up to 2 bicycles at a time, specifically for families with children 18 years or below. The system must track the bicycles (name, make, type, and availability) and users (name, ID, and borrowed bicycles).
The company also wants to ensure that the system uses a multidimensional array to store information about the bicycles.
Requirements:
Add and View Bicycles:
Borrow Bicycles:
Return Bicycles
Display Borrowed Bicycles and Search for a bicycle
Create a menu-driven program to implement the above.
Sample Output:
Add Bicycle
View All Bicycles
Borrow Bicycle
Return…
Add a method called transfer () to the BankAccount class, that takes in an amount and
destinationAccount as input and transfer the funds from current account to destination
account.
This method should return the balance of the current account after the transfer, also should
check for the sufficient balance in current account before proceeding the transfer and if there is
insufficient balance return an error message "Insufficient balance".
Modify the BankAccount Test class, so that it calls the transfer () method and prints the
balance after transfer.
Make sure that the transfer() method updates the balance of both the current account
and the destination account.
• Create a public method called deposit() that takes in an amount of type double as input
and adds the amount to the current balance. This method should also return the updated
balance.
• Create another public method called withdraw() that takes in an amount of type double as
input, checks if the withdrawal amount is less than the current balance, and if so, subtracts
the amount from the balance. If the withdrawal amount is greater than the current balance,
the method should return an error message "Insufficient balance".
• Create a public method getAccountInfo() that returns the account information in the format
"Account Number: xxxxx, Account Holder: John Doe, Account Type: SAVINGS/CHECKING,
Balance: $xxxX.XX".
• Finally, create a constructor method that takes in the account number, account holder name,
initial balance and account type as input and initializes the corresponding instance variables.
In the BankAccount class, make sure to use the private access modifier for the
instance…
Chapter 2 Solutions
EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
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