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Book Overview & Buying
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Table Of Contents
Data Analysis Using SQL and Excel - Second Edition
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In the beginning, there is data. Although data may seem to be without form and chaotic, there is an organization to it, an organization based on tables and columns and relationships between and among them. Relational databases store structured data—that is, tables with well-defined rows and columns.
This section describes databases by the data they contain. It introduces entity-relationship diagrams, in the context of the datasets (and associated data models) used with this book. These datasets are not intended to represent all the myriad different ways that data might be stored in databases; instead, they are intended as practice data for the ideas in the book. They are available on the companion website, along with all the examples in the book.
The definition of the tables, the columns, and the relationships among them constitute the data model for the database. A well-designed database actually has two data models. The...
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