Database Systems: Design, Implementation, Management, Loose-leaf Version
12th Edition
ISBN: 9781305866799
Author: Coronel, Carlos; Morris, Steven
Publisher: Course Technology
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Chapter 2, Problem 15RQ
Explanation of Solution
Connectivity:
Connectivity is a relational term that is often used by the ER (Entity Relationship) model to label the types of relationships (1:1(One-to-one), 1:M (one-to-many), M:N (“Many-to-many)).
- The above figure shows a Crow’s foot ERD(Entity Relationship Diagram) to illustrate connectivity...
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8. Cash RegisterThis exercise assumes you have created the RetailItem class for Programming Exercise 5. Create a CashRegister class that can be used with the RetailItem class. The CashRegister class should be able to internally keep a list of RetailItem objects. The class should have the following methods:
A method named purchase_item that accepts a RetailItem object as an argument. Each time the purchase_item method is called, the RetailItem object that is passed as an argument should be added to the list.
A method named get_total that returns the total price of all the RetailItem objects stored in the CashRegister object’s internal list.
A method named show_items that displays data about the RetailItem objects stored in the CashRegister object’s internal list.
A method named clear that should clear the CashRegister object’s internal list.
Demonstrate the CashRegister class in a program that allows the user to select several items for purchase. When the user is ready to check out, the…
5. RetailItem ClassWrite a class named RetailItem that holds data about an item in a retail store. The class should store the following data in attributes: item description, units in inventory, and price.
Once you have written the class, write a program that creates three RetailItem objects and stores the following data in them:
Description Units in Inventory PriceItem #1 Jacket 12 59.95Item #2 Designer Jeans 40 34.95Item #3 Shirt 20 24.95
Find the Error:
class Information:
def __init__(self, name, address, age, phone_number):
self.__name = name
self.__address = address
self.__age = age
self.__phone_number = phone_number
def main():
my_info = Information('John Doe','111 My Street', \
'555-555-1281')
Chapter 2 Solutions
Database Systems: Design, Implementation, Management, Loose-leaf Version
Ch. 2 - Prob. 1RQCh. 2 - What is a business rule, and what is its purpose...Ch. 2 - How do you translate business rules into data...Ch. 2 - Prob. 4RQCh. 2 - Explain how the entity relationship (ER) model...Ch. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - What is a relationship, and what three types of...Ch. 2 - Give an example of each of the three types of...Ch. 2 - What is a table, and what role does it play in the...Ch. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 20RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 23RQCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Typically, a hospital patient receives medications...Ch. 2 - Prob. 10PCh. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17P
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