DATABASE SYSTEMS
13th Edition
ISBN: 9780357095607
Author: Coronel
Publisher: CENGAGE L
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Chapter 7, Problem 18RQ
Explanation of Solution
Difference between UNION and UNION ALL:
| UNION | UNION ALL |
| The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values. | The UNION ALL set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains duplicate values. |
| Syntax: QUERY UNION QUERY; | Syntax: QUERY UNION ALL QUERY; |
|
Example: Consider two tables: The table “T1(ID, fruit_name)” contains rows with values (1, 'Mango' ), (1, 'Orange' ), (3, 'Grapes' )... |
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Students have asked these similar questions
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…
Create a BankAccount Test class that contains a main() method that instantiates an object of
type BankAccount, with account number of 12345, account holder name of "John Doe", initial
balance of $1000 and account type as SAVINGS . Then use the deposit() and withdraw()
methods of the object to deposit $500 and withdraw $300. Finally, use the getAccountInfo()
method to print the current account information.
Use the getAccountInfo() method to verify that the deposit and withdrawal actions are
performed correctly and that the account information is updated accordingly.
Chapter 7 Solutions
DATABASE SYSTEMS
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