By John Petersen
Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the genuine newbie. It not just offers particular fingers on perform, but additionally offers an summary of designing, conserving and utilizing a database. This publication covers what databases are used for, why databases are very important, why the layout of the database is critical, database normalization, keys to strong 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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Extra resources for Absolute Beginner s Guide to Databases
12). 12 Tables in multitable queries are automatically related based on the relationships defined in the database. 13. 13 The output in a multitable query appears as one logical table. Reports Data in a database is not of much use if it can’t be accessed and used in a userfriendly manner. When you embark on the database application development process, invariably, you will be asked about which reports can be generated. 14). 14 The report definitions in the Northwind Traders Database. CHAPTER 2 THE ANATOMY OF A REAL DATABASE 35 To illustrate how the reports work, consider the Products by Category query.
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.
19 shows the form definitions in the Northwind Traders Database. 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.
Absolute Beginner s Guide to Databases by John Petersen