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Rebecca M. Riordan's Designing Relational Database Systems PDF

By Rebecca M. Riordan

ISBN-10: 073560634X

ISBN-13: 9780735606340

Simply because they are so complex, many books on relational databases are both burdensomely educational (Database administration structures is the vintage instance of this mode - it is fantastic, yet one essentially wishes a professor that will help you decode it) or so practical-minded as to be overly basic. Designing Relational Database platforms has struck an enticing stability among the 2 extremes via delivering sufficient concept to help you layout your databases intelligently, whereas retaining in brain real-world enterprise practices and the sensible obstacles of tangible database administration systems.Author Rebecca Riordan emphasizes Microsoft database items to a small measure, utilizing Microsoft entry and the Jet engine in a few of her examples. The Microsoft overtones are usually not overpowering, in any way.

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The chain now changes direction only once, at OrderDetails, and the relationship has been maintained. Notice, however, that the Products entity hasn't been eliminated. Chances are good that orders will still be placed for Products rather than for SupplierProducts, and maintaining the Products entity allows the user interface to accommodate this. Of course, you might not care about the ternary relationships in your problem space, or there may be some other way of tracing the relationship when necessary, such as a lot number on the packaging.

NOTE Designers often specify the validity of empty and unknown values at the entity level rather than the domain level. In fact, some designers would argue that these constraints apply only at the entity level. There is some justification for this position, but I recommend making the domain definition as complete as possible. Certainly, considering empty and unknown values at the domain level does no harm and can make the process of specification (and implementation) simpler. In addition to narrowing the range of values for a single attribute, entity constraints can also effect multiple attributes.

Take, for example, the relationship shown in Figure 3-12. Figure 3-12. This relationship is optional in both directions. The relationship between Client and CustomerServiceRep is optional in both directions. In English, this would be expressed as a "CustomerServiceRep can have zero or more clients. " Specifying optionality on the one side of a one-to-many relationship has important implications for both the implementation and usability of the system. We'll discuss these issues in detail in Chapters 4 and 14, but understand here that relational theory does not require that the one side of a one-to-many relationship be mandatory.

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Designing Relational Database Systems by Rebecca M. Riordan

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