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By Vidya Vrat Agarwal
Starting VB 2008 Databases is for each VB programmer. This publication assumes no previous database adventure, and teaches, constantly via hands-on examples, the way to create and use relational databases with the traditional database language SQL and the way to entry them with VB. nearly each program must entry a database, and this publication concisely teaches the entire basics needed—and such a lot which are ever needed—to improve expert database functions.
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Additional info for Beginning VB 2008 Databases: From Novice to Professional (Beginning: from Novice to Professional)
Example text
Normalizing a logical database design involves a set of formal processes to separate the data into multiple, related tables. The result of each process is referred to as a normal form. Five normal forms have been identified in theory, but most of the time third normal form (3NF) is as far as you need to go in practice. To be in 3NF, a relation (the formal term for what SQL calls a table and the precise concept on which the mathematical theory of normalization rests) must already be in second normal form (2NF), and 2NF requires a relation to be in first normal form (1NF).
Qxd 2/21/08 2:59 PM Page 13 CHAPTER 1 ■ GETTING YOUR TOOLS Figure 1-14. AdventureWorks database in SQL Server Management Studio Express Summary In this chapter, you learned to install Visual Studio 2008, SQL Server Management Studio Express, and the sample Northwind and AdventureWorks databases. You used sqlcmd to create and query the Northwind database from a SQLExpress instance. You also used SQL Server Management Studio Express to attach the AdventureWorks database in SQL Server 2005. Now that you have your tools, it’s time to get acquainted with them.
A primary key will be defined only once, but it can have up to 16 attributes). The primary key represents the parent entity. Primary keys are usually defined with the IDENTITY property, which allows insertion of an auto-incremented integer value into the table when you insert a row into the table. Foreign Keys A foreign key is an attribute that completes a relationship by identifying the parent entity. Foreign keys provide a method for maintaining integrity in the data (called referential integrity) and for navigating between different instances of an entity.