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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 2, Problem 22RQ
Textbook Problem
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What is logical independence?

Program Plan Intro

Data Independence:

  • “Data Independence” refers to the ability to modify a schema definition in one level without affecting a schema definition in different level.
  • It is a type of data transparency, which focuses for a centralised DBMS (Database Management System).
    • One of the biggest advantages of databases is data independence.
    • There are two levels of data independence, one is “Physical data independence” and the other one is “Logical data independence”.

Explanation of Solution

Logical data independence:

  • Logical data independence is the ability to modify the logical or conceptual schema without changing the external schema (user view).
  • Logical data independence is any database applications that relates to view, where the user can view the data rather than modifying it.
  • If the logical structure of the database is changed then it is necessary to have modifications at the logical level.
  • In other term it means that if some new rows or columns are added or if some rows or columns are removed from a table, then the user view and programs should not change...

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Chapter 2 Solutions

Database Systems: Design, Implementation, & Management
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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 - What is a relational diagram? Give an example.Ch. 2 - What is connectivity? (Use a Crows Foot ERD to...Ch. 2 - Describe the Big Data phenomenon.Ch. 2 - What does the term 3 Vs refer to?Ch. 2 - What is Hadoop, and what are its basic components?Ch. 2 - What is sparse data? Give an example.Ch. 2 - What are the basic characteristics of a NoSQL...Ch. 2 - What is logical independence?Ch. 2 - What is physical independence?Ch. 2 - Use the contents of Figure 2.1 to work Problems...Ch. 2 - Use the contents of Figure 2.1 to work Problems 13...Ch. 2 - Use the contents of Figure 2.1 to work Problems 13...Ch. 2 - Using Figure P2.4 as your guide, work Problems 45....Ch. 2 - Using Figure P2.4 as your guide, work Problems 45....Ch. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Typically, a hospital patient receives medications...Ch. 2 - United Broke Artists (UBA) is a broker for...Ch. 2 - Using the ERD from Problem 10, create the...Ch. 2 - Convert the ERD from Problem 10 into a...Ch. 2 - Describe the relationships (identify the business...Ch. 2 - Create a Crows Foot ERD to include the following...Ch. 2 - Write the business rules that are reflected in the...Ch. 2 - Create a Crows Foot ERD for each of the following...Ch. 2 - Write the business rules that are reflected in the...

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