EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
expand_more
expand_more
format_list_bulleted
Expert Solution & Answer
Chapter 5, Problem 5.5RQ
Explanation of Solution
Denormalization:
A process of combining two relations into one new relation is called as “Denormalization”.
Example:
Consider the example of denormalization is as follows:
Normalized table:
Sales:
| Sales_id | Sales_date | Sales_person |
Product:
| Tax_id | Sales_id | Itm_id | Item_quantity | Sales_rs |
After denormalization the “Product” table is as follows:
| Tax_id | Sales_date | Sales_person | Sales_id | Item_id |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
How is discrepancy computed?
How do data dictionaries assist in enforcing data integrity constraints?
When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?
Chapter 5 Solutions
EBK DATABASE CONCEPTS
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
Knowledge Booster
Similar questions
- A select operation in a relational database decreases the size of a table by removing columns that fulfill given criteria.Is this statement truthful or false?arrow_forwardIs a NULL value in a database the same as a blank space or a value of zero?arrow_forwardHow do data dictionaries assist in data validation and consistency checks?arrow_forward
- Reducing the size of a table in a relational database may be done using a select operation by removing columns that aren't needed.Is that so, or not?arrow_forwardA select operation in a relational database decreases the size of a table by deleting columns that fulfill certain criteria.Is it correct or incorrect?arrow_forwardA select operation in a relational database decreases the size of a table by removing columns that fulfill certain criteria.Is this statement truthful or false?arrow_forward
- ormulate the following queries in Structured Query Language SQL The following tables form part of a database held in an RDBMS: Employee (empNo, fName, lName, address, DOB, sex, position, salary, deptNo) Department (deptNo, deptName, mgrEmpNo) Project (projNo, projName, deptNo) WorksOn (empNo, projNo, dateWorked, hoursWorked) where Employee contains employee details and empNo is the key. Department contains department details and deptNo is the key. mgrEmpNo identifies the employee who is the manager of the department. There is only one manager foreach department. Project contains details of the projects in each department and the key is projNo (notwo departments can run the same project). WorksOn contains details of the hours worked by employees on each project, and empNo/ projNo/dateWorked form the key. Formulate the following queries in Structured Query Language SQL List all the details of employees who are female and born after 1990. List employee numbers and names of all…arrow_forwardPlease help me answer these three questions regarding Oracle database. All are T or F. Explanation is much appreciated as well. Group functions do ignore NULL values Multiple row functions works on each records one by one and they return one result per each record Multiple row functions works on group of records all at once but they also return one result per each data setarrow_forwardExplain the difference between redundancy and diversity.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Information Systems (MindTap Course...Computer ScienceISBN:9781305971776Author:Ralph Stair, George ReynoldsPublisher:Cengage Learning
C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781305627482Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781285196145Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos CoronelPublisher:Cengage Learning
A Guide to SQLComputer ScienceISBN:9781111527273Author:Philip J. PrattPublisher:Course Technology Ptr
Principles of Information Systems (MindTap Course...
Computer Science
ISBN:9781305971776
Author:Ralph Stair, George Reynolds
Publisher:Cengage Learning
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Cengage Learning
A Guide to SQL
Computer Science
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Course Technology Ptr