EBK ORACLE 12C: SQL
EBK ORACLE 12C: SQL
3rd Edition
ISBN: 9781305465305
Author: CASTEEL
Publisher: YUZU
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Chapter 2, Problem 1RQ

Explanation of Solution

Data dictionary:

Data dictionary is referred as the components of Database Management System (DBMS) that store the data features and associations. It also refers the data about data.

  • It offers the DBMS with features of self-describing.
  • It resembles x-ray of company’s complete data set and it is vital component in data administration.
  • There are two main types of data dictionaries. They are as follows:
    • Integrated data dictionary
    • Standalone data dictionary
  • The functions of data dictionary in the database design are listed below:
    • The contents of data dictionary are used for verifying the components of database design such as entities, attributes and relationships that exists between them.
    • Database design is used by the designer to check for their homonyms and synonyms.
    • It also verifies the entities and attributes created can be able to support all the queries in required way along with report requirements.

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Add a new class Checking Account that inherits from the BankAccount class, and has a double instance variable overdraftLimit in addition to the variables inherited from the superclass. Create a constructor for the Checking Account class that takes in the account number, account holder name, initial balance, account type and overdraft limit as input, and uses the super keyword to call the constructor of the superclass, passing in the account number, account holder name and initial balance, account type. Re-write the withdraw() method in the CheckingAccount class so that it first checks if the withdrawal amount is less than the current balance plus the overdraft limit. If it is, the withdrawal is allowed and the balance is updated. If not, the method should return an error message "Insufficient funds". Create a new method displayOverdraft Limit() that returns the overdraft limit of the Checking Account. In the BankAccountTest class, create a new object of type Checking Account with…
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Chapter 2 Solutions

EBK ORACLE 12C: SQL

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