Databases DeMYSTiFieD, 2nd Edition by Andy Oppel

By Andy Oppel

Studying DATABASE basics simply obtained plenty more straightforward! you can now layout, construct, and deal with an absolutely practical database conveniently. completely up to date to hide the most recent applied sciences and strategies, Databases Demystified, moment variation offers the hands-on assist you have to start. Written in a step by step structure, this functional consultant covers tools that may be used with any database, together with Microsoft entry, MySQL, Microsoft SQL Server, and Oracle. you are going to know about relational database elements, database queries, SQL, the database lifestyles cycle, logical database layout utilizing normalization, and actual database layout. information and approach modeling, database safeguard, on-line Analytical Processing (OLAP), and XML also are coated. exact examples and concise causes make it effortless to appreciate the fabric, and end-of-chapter quizzes and a last examination support toughen studying. it is a no-brainer! you will find out the way to: Create and run database queries utilizing the forms-based question software in Microsoft entry Write SQL statements and queries Use entity dating diagrams (ERDs) for information modeling layout actual tables attach databases to clients, desktops, and functions safe database info deal with cursor processing, transaction administration, and function tuning combine XML files and items into databases easy sufficient for a newbie, yet not easy sufficient for a sophisticated pupil, Databases Demystified, moment version is your self-paced consultant to studying common database strategies.

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In contrast with the hierarchical model, the relationships are named so the programmer can direct the database to use a particular relationship to navigate from one record to another in the database, thus allowing a record type to participate as the child in multiple relationships. The network model provided greater flexibility, but as is often the case with computer systems, at the expense of greater complexity. The network model structure for Northwind, as shown in Figure 1-5, has Customer all the same records as the equivalent hierarchical model structure that appeared in Figure 1-3.

As you will learn in Chapter 6, this one-toone correspondence between flat files and relational tables will not always hold true, but it is quite common. In Figure 1-7, lines are drawn between the tables to show the one-to-many relationships, with the single-line end denoting the “one” side and the line end that splits into three parts (called a “crow’s foot”) denoting the “many” side. For example, merely by inspecting the lines that connect these tables, you can see that “one” customer is related to “many” orders and that “one” order is related to “many” order details.

In fact, they are the fundamental building block of the relational database model in that all relationships in a relational database are implemented as if they are one-to-many. It is rare for them to be optional on the “one” side and even more rare for them to be mandatory on the “many” side, but these situations do occur. Consider the examples shown in Figure 2-3. When a customer account closes, we record the reason it was closed using an account closure reason code. Because some 33 34 D ata b a s e s Demys tified Account Closure Reason accounts are open at any point in time, this Account Closure Reason Code is an optional code.

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