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 supplies particular palms on perform, but in addition presents an summary of designing, retaining and utilizing a database. This e-book covers what databases are used for, why databases are very important, why the layout of the database is necessary, database normalization, keys to good database layout, transformations in kinds of databases, and indexes--what they're, how we use them, and why they're very important.
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Extra resources for Absolute Beginner s Guide to Databases
Com/office/visio/. ■ Resolution xCase—This is a full-featured database design tool that works with SQL Server, Access, Sybase, Informix, DB2, and many other databases on the market today. com. htm. htm. For purposes of illustrating database modeling and related notation, this book uses Microsoft Visio. Creating Your First Model Let’s take a step back and start with a fleshed-out design to get you familiar with how to create a graphical database model. In this hypothetical situation, you have identified the following entities: ■ Customers ■ Orders ■ Order Line Items Note All the concepts in this section can be employed with tools as simple as a piece of paper and a pencil.
As you develop different database systems, you will find the process of requirements gathering to be very repeatable. Among the many sources of information regarding database requirements, the most common include interviews, business forms, and existing systems. Interviews For all the computing power companies use today, people still make the decisions and make things happen in a business. Don’t underestimate the power of talking and—perhaps more important—listening to the employees of a firm. These people might not be able to speak in technical database terms, but then again, that is why you are on the scene—to be the gatherer and translator of information.
19 The form definitions in the Northwind Traders Database. AM FL Y In several contexts, the Products table has been discussed. 20). To review, consider the following relationships involving the Products table: ■ A product belongs to one category. 20 The Products form provides a user-friendly way of entering data for a given product. TE ■ A product is supplied by one supplier. Supplier lookup Category lookup Because the Products table is involved in two relationships, two lookups exist for the Products table.