ComputerScienceExpert

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About ComputerScienceExpert

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Elementary,Middle School,High School,College,University,PHD

Expertise:
Applied Sciences,Calculus See all
Applied Sciences,Calculus,Chemistry,Computer Science,Environmental science,Information Systems,Science Hide all
Teaching Since: Apr 2017
Last Sign in: 10 Weeks Ago
Questions Answered: 4870
Tutorials Posted: 4863

Education

  • MBA IT, Mater in Science and Technology
    Devry
    Jul-1996 - Jul-2000

Experience

  • Professor
    Devry University
    Mar-2010 - Oct-2016

Category > Programming Posted 29 Apr 2017 My Price 8.00

data normalization

Hello, How are you? check the attachment and let me if you more information. Thank you

 

 

Review Questions What is data normalization? Why is it required? What is the main purpose of data de-normalization? What are the categories of data models? Explain them briefly. What is data independence? Please have some exercises of writing SQL scripts. Go through the ER model again. Try to draw an ER model for a real-world database. Explain briefly the three-schema architecture. Why was it proposed? Consider the relational database of Figure 1. Give an expression in the relational algebra to
express each of the following queries:
a. Find the names of all employees.
b. Find the names of all employees who live in city “Miami”.
c. Find the names of all employees whose salary is greater than $100,000.
d. Find the names of all employees who live in “Miami” and whose salary is greater than
$100,000.
employee (person_name, street, city)
works (person_name, company_name, salary)
company (company_name, city)
Figure 1

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Answers

ComputerScienceExpert
(11)
Status NEW Posted 29 Apr 2017 05:04 AM My Price 8.00

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Attachments

file 1493444978-Solutions file 2.docx preview (51 words )
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