Access database design and programming by Steven Roman

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By Steven Roman

I've been utilizing entry and VBA for many years, with none formal education in relational database or programming. during this concise e-book, Steven Roman controlled to offer a powerful starting place within the conception of relational databases, VBA and DAO.

Armed with this data, I now have the boldness to dig deeper in those 3 issues and research extra complex material.

One draw back notwithstanding: i discovered the final a part of the e-book on ADO really complicated. Steven Roman prefers DAO to ADO and it shows.

I however supply the publication five stars, because the first 3 elements of the e-book are stellar.

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To see this, observe that the keys are {City,StreetName} and {ZipCode,StreetName}. Hence, no attribute is strictly informational, and there is nothing to violate third normal form. On the other hand, consider Table 4-4. We can fill in the blank city name because {ZipCode} {City}. Table 4-4. A table with dependencies City StreetName Hollywood Blvd Vine St Los Angeles ZipCode 95000 95000 The problem here is with the dependency: {ZipCode} {City} which does not violate third normal form because, as we have mentioned, {City} is not strictly informational.

Otherwise, perhaps not. 4 Functional Dependencies Before we can discuss the other normal forms, we need to discuss the concept of functional dependency , which is used to define these normal forms. This concept is quite simple, and we have actually been using it for some time now. As an example, we have remarked that, for the Publishers table scheme, the PubName attribute depends completely on the PubID attribute. ) Thus, we can say that the functional dependency from PubID to PubName, written: PubID PubName holds for the Publishers table scheme.

This requires implementing several things: • • • • The entities The entity classes The entity sets The relationships between the entity classes The result of this implementation is a relational database. As we will see, implementing the relationships usually involves some changes to the entity classes, perhaps by adding new attributes to existing entity classes or by adding new entity classes. 1 Implementing Entities As discussed in the previous chapter, an entity is implemented (or described in concrete terms) simply by giving the values of its attributes.

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