Database Systems: Design, Implementation, & Management
Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 14, Problem 6RQ
Program Plan Intro

Stream Processing:

  • Stream processing is a technology that lets users query continuous data stream and detect conditions within small time period after receiving the data.
  • The decision is made to know which data should be stored and which should be discarded.
  • In some situations, large volumes of data enter the system, but it is not feasible to store all of the data.
  • So as soon as the data enters the system, it should be processed and filtered to detect which data to keep and which data to discard.

Feedback Loop Processing:

  • Feedback loop is the process of capturing data, then processing it into information, and using that information for other purposes.
  • It refers to the process of data analysis to produce actionable results.
  • Feedback loop is a key component in data analytics, which helps organizations sift through terabytes and petabytes of data to help decision makers in making strategic and tactical decisions faster.

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using r language
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
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