Databases DeMYSTiFieD, 2nd Edition by Andy Oppel

By Andy Oppel

Studying DATABASE basics simply acquired an awful lot more uncomplicated! you can now layout, construct, and deal with an absolutely sensible database conveniently. completely up to date to hide the newest applied sciences and methods, Databases Demystified, moment variation delivers the hands-on assist you have to start. Written in a step by step layout, this sensible advisor covers equipment that may be used with any database, together with Microsoft entry, MySQL, Microsoft SQL Server, and Oracle. you will find out about relational database elements, database queries, SQL, the database existence cycle, logical database layout utilizing normalization, and actual database layout. info and technique modeling, database safety, on-line Analytical Processing (OLAP), and XML also are coated. distinctive examples and concise causes make it effortless to appreciate the cloth, and end-of-chapter quizzes and a last examination support strengthen studying. it is a no-brainer! you will discover out the right way to: Create and run database queries utilizing the forms-based question software in Microsoft entry Write SQL statements and queries Use entity courting diagrams (ERDs) for facts modeling layout actual tables attach databases to clients, computers, and functions safe database facts deal with cursor processing, transaction administration, and function tuning combine XML records and gadgets into databases easy sufficient for a newbie, yet not easy sufficient for a complicated pupil, Databases Demystified, moment variation is your self-paced consultant to studying common database ideas.

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Let us next suppose that City State/Province as a matter of company policy, no customer Country/Region account can be opened without first obtain- Business Phone Account Closure Reason Code (FK) ing a credit report, and that all credit reports are kept in the database, meaning that any Credit Report customer may have more than one credit Credit Report Number report in the database. This makes the relaReport Date Credit Score tionship between the Customer and Credit Notes Report entities one-to-many, and mandaCustomer ID (FK) tory in both directions.

General Electric’s IDS was the first known network database. 25 This page intentionally left blank chapter 2 Exploring Relational Database Components In this chapter, we explore the conceptual, logical, and physical components that the relational model comprises. The processes involved in database design are covered in Chapter 5. In the sections that follow, we explore first the components of a conceptual database design, and then the components of a logical and physical design. CHAPTER OBJECTIVES In this chapter, the reader should: • Understand conceptual database design components, including entities, attributes, relationships, and business rules.

A cynic would say that a camel is a horse that was designed by a committee, and that may be accurate in this case. The most popular database based on the network model was the Integrated Database Management System (IDMS), originally developed by Cullinane (later renamed Cullinet). The product was enhanced with relational extensions, named IDMS/R, and eventually sold to Computer Associates. As with the hierarchical model, record types (or simply “records”) depict what would be separate files in a flat file system, and those records are related using one-to-many relationships, called owner-member relationships or sets in network model terminology.

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