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Do you think that ll happen, or will domain experts, say biologists, always have to team up with programmers to build custom software to solve their problems Ingalls: I think there will be that kind of collaboration because the biologist isn t interested in programming it He s interested in finding out this or that Then there s somebody who understands how this stuff is being worked on on the computers who can help him do that I think the thing that lets a nonprogrammer program is an application Seibel: I worked on a project that tried to provide a programming environment for biologists on the theory that the software they would need would always be ad hoc.

(The socalled hierarchic and network models, which are often thought to have predated the relational model, were actually defined after the fact by a process of induction in this context, a polite word for guesswork from existing implementations) In connection with both the relational model in particular and data models in general, the paper also stressed the importance of the distinction, regrettably underappreciated even today, between a data model and its physical implementation Ted also saw the potential of using predicate logic as a foundation for a database language He discussed this possibility briefly in his 1969 and 1970 papers, and then, using the predicate logic idea as a basis, went on to describe in detail what was probably the very first relational language to be defined, Data Sublanguage ALPHA, in: A Data Base Sublanguage Founded on the Relational Calculus, Proc.

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You couldn t build an application and be done with it because the biologists didn t really know what they needed until they got down to some piece of biological data and said, What I really want to.

1971 ACM SIGFIDET Workshop on Data Description, Access and Control, San Diego, Calif (November 1971) ALPHA as such was never implemented, but it was extremely influential on certain other languages that were, including in particular the Ingres language QUEL and (to a much lesser extent) the IBM language SQL as well If I might be permitted a personal anecdote at this point, I remember being invited, in 1974, to Anaheim, California, to present the basic ideas of the relational model to the GUIDE Database Language Working Group (I probably don t have that title quite right, but it was a project within GUIDE, the IBM user group, to examine possible programming language extensions for database access) Members of the working group had coded five sample applications using various database products of the time (TOTAL, IDS, IMS, etc), and the meeting began with those various solutions being presented.

When developing an Ajax and REST application, you must decide on the tools and frameworks you ll use. The choice is simple: Use whatever you re using today, and write some Ajax applications. You don t need to change the tools you re using today. Whether you re using ASP .NET, JavaServer Pages (JSP), PHP Ruby, or Python, you can continue with those tools. , Ajax uses JavaScript, DHTML, and the XMLHttpRequest object, but ASP .NET, PHP and simi, lar technologies don t hinder you from writing HTML pages that make use of Ajax techniques. If your technology does hinder you from writing Ajax applications, then you should think hard about continuing using the technology. After all, you re reading an Ajax and REST recipe book, so I assume that you plan on implementing Ajax and REST solutions. Next, you want to decouple the client from the server, as illustrated in Figure 1-8.

I distinctly remember the group s reaction (chiefly amazement, mingled with delight) when I was able to show that each of their applications which I came to stone cold, never having seen them before that afternoon involved just one line of ALPHA code! At that point, the IBM representative to the group took me off to one side and told me not to come on too strong about this relational stuff I said: Why not He said: Because we don t have a product To which I answered: Then maybe we should get one SQL/DS was announced a mere seven years later .. Back to Ted Ted subsequently defined the relational calculus more formally, as well as the relational algebra, in: Relational Completeness of Data Base Sublanguages, in Randall J Rustin (ed.

Dan Ingalls know is X, and the only way to extract X from that data was, essentially, to write a program Ingalls: Yeah, it would be nice if we could have some computing environment with all your information in it so you could somehow figure out how to get to it all just by its self-revealing nature But I think that there are people who are going to be interested in that and people who aren t Seibel: Is there anything I haven t asked about that you thought I might Ingalls: Often, reading about famous people, the side of it that I m interested in is, how do they make their life work All the things that weren t their passion, and how did they deal with that, and with their family, and with their finances, and balancing that.

), Data Base Systems: Courant Computer Science Symposia Series 6 (Prentice-Hall, 1972) Very loosely speaking, relational calculus provides a notation for defining some desired relation (typically the result of some query) in terms of others, while relational algebra provides a set of operators for computing some desired relation from others Clearly, each could be used.

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