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Adobe ColdFusion 9 Getting Started V1 by Ben Forta

By Ben Forta

Эта книга поможет разработчикам познакомиться с ColdFusion. Эта часть начинается с основополагающих концептов и доходит до построения сложных приложений, внедрения механизмов защиты и т.пWritten through the simplest recognized and so much depended on identify within the ColdFusion group, Ben Forta, The ColdFusion net program building equipment is the best-selling ColdFusion sequence of all time - the books that almost all ColdFusion builders used to profit the product. This Getting all started quantity begins with internet and web basics and database strategies and layout, after which progresses to themes together with growing data-driven pages, development whole purposes, imposing defense mechanisms, integrating with e mail, construction reusable capabilities and elements, producing data-driven reviews and graphs, development Ajax-powered consumer interfaces, and lots more and plenty extra.

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You add two new columns, one for the director’s first name and one for the last name. Now, every movie record can contain the name of the director, and you even create a report of all movies including director information. Once again, you and your database have saved the day, and all is well—or so you think. Just when things are looking good, you get a memo asking you to include movie expenses in your database so as to be able to run reports containing this information. You think for a few moments and come up with two solutions to this new problem.

The many-to-many relationship allows one or more rows in one table to be associated with one or more rows in another table. This type of relationship is usually the result of bad design. Most many-to-many relationships can be more efficiently managed with multiple one-to-many relationships. Multi-Table Relationships Now that you understand relational databases, let’s look at the directors problem again. You will recall that the initial solution was to add the directors directly into the movie table, but that was not a viable solution because it would not allow for multiple directors in a single movie.

This problem probably isn’t too serious if the conflicting data is the spelling of a name, but imagine that the data is customer-billing information. If you reenter a customer’s address with each order and then the customer moves, you could end up shipping orders to an incorrect address. You should avoid maintaining multiple live copies of the same data whenever possible. note Another important rule in database design is that data should never be repeated unnecessarily. As you multiply the number of copies you have of the same data, the chance of data-entry errors also multiplies.

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