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The SQL Workshop

You're reading from   The SQL Workshop Learn to create, manipulate and secure data and manage relational databases with SQL

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Product type Paperback
Published in Dec 2019
Publisher Packt
ISBN-13 9781838642358
Length 288 pages
Edition 1st Edition
Languages
Concepts
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Authors (3):
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Prashanth Jayaram Prashanth Jayaram
Author Profile Icon Prashanth Jayaram
Prashanth Jayaram
Frank Solomon Frank Solomon
Author Profile Icon Frank Solomon
Frank Solomon
Awni Al Saqqa Awni Al Saqqa
Author Profile Icon Awni Al Saqqa
Awni Al Saqqa
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Toc

Table of Contents (13) Chapters Close

Preface 1. SQL Basics FREE CHAPTER 2. Manipulating Data 3. Normalization 4. The SELECT Statement 5. Shaping Data with the WHERE Clause 6. JOINS 7. Subqueries, Cases, and Views 8. SQL Programming 9. Security 10. Aggregate Functions 11. Advanced SQL Appendix

The Concept of Normalization

Suppose we have a piece of software in our enterprise called Enterprise Server Manager that manages all the computers. The Enterprise Server Manager (ESM) has information about what computers we have, the operating system they run on, the version of the operating system, and so on.

Now, each server works for one or more teams. The respective teams have all the authority on these servers, along with being responsible for them. Imagine that you want the heads of the teams tagged as the owners of the servers. The server entries should contain the employee IDs, the names, the designations, and the department names of these owners. Here is an example:

Figure 3.1: ESM Agent details

The preceding table has all the information we need and the data looks consistent for now, right? Jon Doe's information is being repeated, though. Is that an issue?

Imagine that Jon Doe leaves the organization and Jim Doe replaces him. Now, imagine...

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