New PDF release: Designing Relational Database Systems

By Rebecca M. Riordan

ISBN-10: 073560634X

ISBN-13: 9780735606340

Simply because they're so complex, many books on relational databases are both burdensomely educational (Database administration structures is the vintage instance of this mode - it really is impressive, yet one essentially wishes a professor that will help you decode it) or so practical-minded as to be overly easy. Designing Relational Database platforms has struck an enticing stability among the 2 extremes through delivering sufficient idea to help you layout your databases intelligently, whereas holding 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 will not be overpowering, in any respect.

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Say some very uncharitable things about you? Limitations on cardinality such as these must be implemented as system constraints; they shouldn't be embedded in the structure of the relations themselves. Furthermore, as we'll discuss in Chapter 16, you should think long and hard about the impact on usability before implementing limitations on cardinality at all. Summary In this chapter, we've examined the relationships between entities in detail. We've looked at each type of binary relationship—one-to-one, one-to-many, and many-to-many—and seen how to represent them in the data model by establishing a primary relation and including its candidate key in the other relationship participant, the foreign relation.

As such, they can contain whatever additional attributes are appropriate. Unary Relationships All the relationships discussed so far have been binary relationships having two participants. Unary relationships have only one participant—the relation is associated with itself. The classic example of a unary relationship is Employee to Manager. One's manager is, in most cases, also an employee with a manager of his or her own. Unary relationships are modeled in the same way as binary relationships—the candidate key of the primary relation is added to the foreign relation.

In addition to this theoretical problem, structures like this are unreliable. It might very well be company policy, for example, that managers have a maximum of five employees reporting directly to them, but policy isn't reality. By embedding the policy in the data model, you're implementing it as a non-negotiable system constraint. I'd be willing to bet that you'll discover during initial data entry that at least one manager has six direct reports. What happens then? Will somebody suddenly have a new boss?

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Designing Relational Database Systems by Rebecca M. Riordan


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