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Java Data Analysis

You're reading from   Java Data Analysis Data mining, big data analysis, NoSQL, and data visualization

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787285651
Length 412 pages
Edition 1st Edition
Languages
Concepts
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Author (1):
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John R. Hubbard John R. Hubbard
Author Profile Icon John R. Hubbard
John R. Hubbard
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Toc

Table of Contents (14) Chapters Close

Preface 1. Introduction to Data Analysis 2. Data Preprocessing FREE CHAPTER 3. Data Visualization 4. Statistics 5. Relational Databases 6. Regression Analysis 7. Classification Analysis 8. Cluster Analysis 9. Recommender Systems 10. NoSQL Databases 11. Big Data Analysis with Java A. Java Tools Index

The relation data model


A relational database (RDB) is a database that stores its data in tables that are related by certain structural constraints. The word relational comes from the mathematical concept of a relation, which is essentially the same thing as a table. The precise definition follows.

A domain is a set of data values of the same data type, usually integer, decimal number, or text, but could be Boolean (True/False), nominal, or URL, among others. If D1, D2 ,…, Dn are domains, then their Cartesian product is the set D1, D2,…, Dn of all n-component sequences t = (d1, d2 ,…, dn ), where each di ∈ Di. Such sequences are called tuples (as in octuples when n = 8). A tuple is like a vector, except that the components of a tuple may be of different types; the components of a vector are usually just numbers. A relation is a subset of a Cartesian product of domains; that is, a set of tuples all from the same domain sequence (D1, D2 ,…, Dn), which is called the schema for the relation...

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