By Andy Oppel
Studying DATABASE basics simply received plenty more uncomplicated! you can now layout, construct, and deal with a completely useful database very easily. completely up to date to hide the most recent applied sciences and strategies, Databases Demystified, moment version delivers the hands-on assist you have to start. Written in a step by step structure, this functional 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 lifestyles cycle, logical database layout utilizing normalization, and actual database layout. information and method modeling, database safeguard, on-line Analytical Processing (OLAP), and XML also are coated. exact examples and concise reasons make it effortless to appreciate the fabric, and end-of-chapter quizzes and a last examination aid toughen studying. it is a no-brainer! you can find out how one can: Create and run database queries utilizing the forms-based question instrument in Microsoft entry Write SQL statements and queries Use entity dating diagrams (ERDs) for information modeling layout actual tables attach databases to clients, computers, and functions safe database info deal with cursor processing, transaction administration, and function tuning combine XML files and items into databases easy adequate for a newbie, yet not easy adequate for a sophisticated pupil, Databases Demystified, moment version is your self-paced consultant to studying common database strategies.
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Extra resources for Databases DeMYSTiFieD, 2nd Edition
F. Codd published his famous research paper in 1970. E. 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.
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. By convention, the arrowhead on the lines points from Order Employee the parent record to the child record. Note that the Customer and Employee records now have solid lines in the structure diagram because they can be directly Order Detail Product implemented. In the network model contents examFigure 1-5 • Network model structure for ple shown in Figure 1-6, each parent-child Northwind Chapter 1 D ata b a s e F u n d a m e n ta l s (from previous customer) Order: 56 Order Detail: Product 28 Customer: 6 (to next customer) Order: 79 Employee: 2 Order Detail: Product 7 Order Detail: Product 51 (Other Employee 2 Orders) Figure 1-6 • Network model record contents for Northwind relationship is depicted with a different type of line, illustrating that each has a different name.
9. According to the advocates of the network model, the problems with the relational model are A. An efficient implementation cannot be built. B. Record-at-a-time processing is poorly supported. C. It has no formal mathematical underpinnings. D. It is too complicated. E. It lacks generally accepted standards. 10. Important historic events in database development are A. Early relational databases were built by both IBM and UC Berkeley. B. Nearly all the commercial relational databases are descendents of either System R or Ingres.