New PDF release: Absolute Beginner s Guide to Databases

By John Petersen

ISBN-10: 078972569X

ISBN-13: 9780789725691

Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just supplies particular arms on perform, but in addition presents an outline of designing, preserving 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 critical, database normalization, keys to sturdy database layout, variations in forms 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

Sample text

This relationship is known as a one-to-many relationship. In other words, a customer can have 0 or more orders. Looking at the relationship in reverse, an order can have only one customer. In this case, the Customers table is referred to as the parent, and the Orders table is referred to as the child. The three types of relationships you will encounter as you work with databases are as follows: ■ One-to-One—A record in the parent table is related to one and only one record in the child table. ■ One-to-Many—A record in the parent table is related to zero or more records in the child table.

For example, after you have analyzed a business document, you might have to return to the process of employee interviews to get further clarification of the database requirements. Remember the mantra of patience? The process of requirements gathering might seem like a never-ending process. Some believe that systems and databases are never “complete” because the business environment constantly evolves and changes. At some point, you will acquire enough information to establish an initial database design.

Whether the person is technical or nontechnical, diagrams are much easier to work with. Diagrams enable people to more easily comprehend difficult problems and concepts. Consider the blueprint of a building. Looking at a blueprint, you immediately get a sense of the building’s purpose and structure. The blueprint accomplishes much more than words could ever hope to accomplish. In a sense, a database model is a blueprint of a database. The focus of this section is to get you on the path to creating your first database model.

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Absolute Beginner s Guide to Databases by John Petersen


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