Download e-book for kindle: Beginning VB 2008 Databases: From Novice to Professional by Vidya Vrat Agarwal

By Vidya Vrat Agarwal

ISBN-10: 1590599470

ISBN-13: 9781590599471

Starting VB 2008 Databases is for each VB programmer. This publication assumes no earlier database event, and teaches, constantly via hands-on examples, how one can create and use relational databases with the traditional database language SQL and the way to entry them with VB. virtually each program must entry a database, and this booklet concisely teaches all of the basics needed—and such a lot which are ever needed—to enhance expert database purposes.

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Once candidate keys are identified, choose one, and only one, primary key for each entity. Sometimes it requires more than one attribute to uniquely identify an entity. A primary key that consists of more than one attribute is known as a composite key. , 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.

Cardinality refers to the uniqueness of data values contained in a particular column of a database table. The term relational database refers to the fact that different tables quite often contain related data. For example, one sales rep in a company may take many orders, which were placed by many customers. The products ordered may come from different suppliers, and chances are that each supplier can supply more than one product. All of these relationships exist in almost every database and can be classified as follows: One-to-One (1:1) For each row in Table A, there is at most only one related row in Table B, and vice versa.

Figure 2-8. Connecting to SQL Server 2. A window containing Object Explorer and the Summary tab will appear, and you should be connected to your SQL Server instance named ORCASBETA2_VSTS\ SQLEXPRESS (see Figure 2-9). The top node in Object Explorer should be your SQL Server instance, and the Summary tabbed pane should display folder icons for the five other nodes in Object Explorer. Expand the Databases node in Object Explorer. Figure 2-9. qxd 22 2/21/08 3:04 PM Page 22 CHAPTER 2 ■ GETTING TO KNOW YOUR TOOLS 3.

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Beginning VB 2008 Databases: From Novice to Professional (Beginning: from Novice to Professional) by Vidya Vrat Agarwal


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