DATABASE CONCEPTS+MYITLAB
DATABASE CONCEPTS+MYITLAB
18th Edition
ISBN: 9780134821245
Author: KROENKE
Publisher: PEARSON C
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Chapter 2, Problem 2.11RQ

Explanation of Solution

Non-Unique key:

A non-unique key is the key which identifies more than one fields identified from the database key.

  • It produces the duplicate entries on the database table.

Example:

Let us consider a “student ...

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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')
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