Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 1, Problem 1RQ

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Purpose of an E-R model:

  • Entity-Relationship Model (ERM) is used as a high-level logical data model depicted in the form of picture and it contains the information about the business system.
  • The information can be created and stored in the form of ERM diagram.
  • It is used to identify the individual information and the way they are interrelated in the business system.
  • The main purpose of E-R model is to identify the entities about which the database should store data and the relationships among those entities.

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8. Name and Email AddressesWrite a program that keeps names and email addresses in a dictionary as key-value pairs. The program should display a menu that lets the user look up a person’s email address, add a new name and email address, change an existing email address, and delete an existing name and email address. The program should pickle the dictionary and save it to a file when the user exits the program. Each time the program starts, it should retrieve the dictionary from the file and unpickle it.   How would the user be able to use the program?
Please solve and answer the question correctly please. Thank you!!
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