Download Databases Demystified: A Self-Teaching Guide by Andrew Oppel PDF

By Andrew Oppel

Via transparent language, step by step discussions, and quizzes on the finish of every bankruptcy, the writer makes databases effortless. fast study the center abilities had to layout, configure, deal with, and control databases, no matter if at paintings or at domestic. issues akin to exploring various database types, making plans their layout, minimizing redundant info, designing tables, using database layout techniques, and imposing database protection are lined. this is often that speedy, easy-to-understand instructional that you’ve been trying to find.

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Today there are ANSI standards for relational data types, and the major vendors support all or most of the standard types. However, each vendor has their own “extensions” to the standards, largely in support of data types they developed before there were standards. One could say (in jest) that the greatest thing about database standards is that each vendor has their own unique set. In terms of industry standards for relational databases, Microsoft Access is probably the least compliant of the most popular products.

Lies between the physical and logical layers c. Is directly referenced by database users d. Contains all the user views for the database e. Provides physical data independence CHAPTER 1 Database Fundamentals 6. Physical data independence: a. Is something a database either has or does not have b. Is a property that all computer systems have to some degree c. Allows nondisruptive changes to be made to the physical layer in the ANSI/SPARC model d. Is achieved through the separation of the physical and logical layers of the ANSI/SPARC model e.

Figure 2-1, shown earlier in this chapter, has two such relationships: the one between the Customer and Order entities, and the one between the Employee and Order entities. ” One-to-many relationships are quite common. 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 happen.

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