By John Petersen
Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, excellent for the real newbie. It not just provides particular palms on perform, but additionally offers an outline of designing, keeping and utilizing a database. This ebook covers what databases are used for, why databases are vital, why the layout of the database is necessary, database normalization, keys to strong database layout, ameliorations in forms of databases, and indexes--what they're, how we use them, and why they're vital.
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Additional info for Absolute Beginner s Guide to Databases
The combination of these fields makes up the primary key. In reviewing concepts discussed in Chapter 1, a primary key is the unique identifier of a row for a table. In the case of the Customers table, the primary key or unique identifier is the CustomerID field. 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.
2 THE ANATOMY OF A REAL DATABASE C HAPTER HIGHLIGHTS: ■ An Introduction to Microsoft Access ■ The Sample Northwind Traders Database ■ What You Have Learned 20 ABSOLUTE BEGINNER’S GUIDE TO DATABASES Chapter 1, “An Introduction to Databases,” was devoted to the theoretical aspects of what a database is. This chapter, and most of the remaining parts of this book, are devoted to the practical aspects of what databases are. Databases are tangible entities that you can get your hands around and work with.
One allows duplicate field entries, and the other type does not allow duplicates. Unicode Compression Access supports Unicode character representation, which means characters are represented by two bytes instead of one. With two bytes, multiple language code pages CHAPTER 2 THE ANATOMY OF A REAL DATABASE 31 can be supported. With one byte, on the other hand, a single code page is supported and a smaller disk storage requirement exists. Queries Queries provide a view to data. Most of the time, you will need to use and interact with data in a manner different from the way the data is stored.
Absolute Beginner s Guide to Databases by John Petersen