Visual Basic .NET database programming by Rod Stephens PDF

By Rod Stephens

ISBN-10: 0768655188

ISBN-13: 9780768655186

ISBN-10: 0789726815

ISBN-13: 9780789726810

I used to be really excited while I obtained this ebook. in spite of the fact that, after spending a lot time painstakingly following code that promised a lot yet produced not anything; i will with all honesty say use your assets extra prudently.

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On the other hand, it may make the intermediate designs too confusing to understand. 5, you might have noticed that the Customers and CustomerOrders tables have a master-detail relationship. For a given record in the Customers table, the CustomerOrders table provides details about the orders placed by that customer. One hint that this might be a master-detail relationship is the one-to-many relationship between these entities. One-to-many and master-detail relationships often go hand-in-hand. As is mentioned earlier in this chapter, a master-detail relationship depends on your point of view.

It contains a filtered and rearranged copy of the information stored in the data warehouse. For example, a data mart might include information relating sales, advertising, and market forecasting data, ignoring the rest of the data in the data warehouse. You could use the data mart to analyze the results of different advertising campaigns on sales in different markets. Using the data mart lets you analyze the data more efficiently without having to work through the larger data warehouse. A table in a relational database stores data logically in a two-dimensional array.

First, it allows the program to handle any number of items in a single order. Second, it converts a many-to-many relationship into two one-to-many relationships connected via a new entity. This is important because relational databases do not easily represent general many-to-many relationships directly. To see why relational databases don't model these relationships well, suppose a database has two tables connected with a single field. One record in the first table might correspond to many records in the second.

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