Absolute Beginner s Guide to Databases by John Petersen

By John Petersen

Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, excellent for the genuine newbie. It not just provides particular arms on perform, but additionally presents an summary of designing, preserving and utilizing a database. This ebook covers what databases are used for, why databases are very important, why the layout of the database is critical, database normalization, keys to stable database layout, modifications in forms of databases, and indexes--what they're, how we use them, and why they're vital.

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7, you can see that each customer row has a different value for CustomerID. That same CustomerID value is carried in the Orders table. This is how a database knows which child records belong to a given parent record. 4, you can see the Orders table is both a child and a parent. It is a child with respect to the Customers table and a parent with respect to the Order Details table. From the perspective of the Customers table, the Order Details table is a grandchild. The following summarizes the relationships contained in the Northwind Traders Database: ■ A customer can have zero or more orders, and an order belongs to one customer.

This toggles to the Design View. 3. Click the View button again; this toggles to the Datalist View. The Datalist View is an alternative way of designing a table. It is not as useful as the Design View. 8 Clicking the View button enables the user to toggle between the Design View and Datalist View of a table. Column details, such as column name, data type, and description, can Lookup tab Design View. Field Properties Note It is important to take great care when viewing the structure of a table. As you scroll up and down the list of fields, it can be easy to disrupt the attributes of the field.

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. CHAPTER 3 AN INTRODUCTION TO DATABASE DESIGN 51 What Does a Database Model Look Like? In Chapter 2, “The Anatomy of a Real Database,” you were introduced to your first database model.

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