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Sams Teach Yourself SQL in 24 Hours, Fifth Edition by Arie D. Jones, Ron D. Plew, Ryan Stephens

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Hour 2. Defining Data Structures

What You’ll Learn in This Hour:

A look at the underlying data of a table

An introduction to the basic data types

Instruction on the use of various data types

Examples depicting differences between data types

In this second hour, you learn more about the data you viewed at the end of Hour 1, “Welcome to the World of SQL.” You learn the characteristics of the data and how such data is stored in a relational database. There are several data types, as you’ll soon discover.

What Is Data?

Data is a collection of information stored in a database as one of several different data types. Data includes names, numbers, dollar amounts, text, graphics, decimals, figures, calculations, summarization, and just about ...

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