Absolute Beginner s Guide to Databases by John Petersen

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By John Petersen

Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just offers particular fingers on perform, but in addition offers an outline of designing, protecting and utilizing a database. This publication covers what databases are used for, why databases are vital, why the layout of the database is necessary, database normalization, keys to sturdy database layout, transformations in forms of databases, and indexes--what they're, how we use them, and why they're very important.

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A supplier can supply zero or more products, and a product can be supplied by only one supplier. ■ Categories can be composed of zero or more products, and a product can be a member of only one category. Note How about a product that can be a member of more than one category? If you are thinking that a many-to-many relationship needs to be crafted with a junction table, you are on the right track! You are catching on! 26 ABSOLUTE BEGINNER’S GUIDE TO DATABASES In reviewing the relationships of Northwind Traders, it is clear that the purpose of the database is to support an order-entry operation.

Databases, on the other hand, grow as a business grows. Furthermore, as the business environment changes, the requirements of a database application change as well. The need to track new information, new report requests, and so on (all to one degree or another) requires changes to the underlying database. It has been said that a database application is never finished because a business never stops changing. Database Analyst AM FL Y Perhaps you do not develop programs. Rather, you are somebody who understands the business and the data related to a business.

Examining and analyzing business forms is where you start to get into the nitty-gritty details. The following are examples of business forms: ■ Invoices ■ Reports ■ Shipping documents CHAPTER 3 AN INTRODUCTION TO DATABASE DESIGN 49 ■ Timesheets ■ Customer service surveys ■ Any other piece of paper somebody in the business uses In an interview, you might discover that it is critical the database stores information about customers. Through the analysis and examination of business forms and documents, you discover the specific pieces of customer information that must be captured.

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