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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.

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<s:Label text="{commaFormatter.format(searchService.numResultsAvailable)} results" visible="{Boolean(searchService.numResultsAvailable)}"/> <!-- The results as a List --> <mx:List id="resultsList" showDataTips="true" dataProvider="{searchService.lastResult}" variableRowHeight="true" width="100%" height="100%"> </mx:List> </s:SkinnableContainer> </s:Application>

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.

I won t explain the Yahoo! client library itself. For that, you can peruse the ASDoc available in the SDK. Let me assure you it s intuitive and easy to understand.

Run on Ubuntu Jaunty, gdebi tells you that older versions of the Synfig packages are available from the official repository and that the official packages are recommended. In this case, you know that the official packages are broken, so the warning isn t very useful. Why would you be trying to update the package manually unless there was a problem with it, given the ease and convenience of using Synaptic Gdebi also warns that installing packages manually from repositories other than Ubuntu s can be a security risk, and asks you for your password. However, because you re downloading packages from Debian or its mirrors, which is the same place Ubuntu gets them from, you have to consider that warning in context (see Figure 5-14).

), 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.

With that, the REST web service example is complete. Now, let s move on to a few web service protocols beyond SOAP and REST. Aside from the big two, XML-RPC, JSON-RPC, and Hessian (from Caucho Technologies http://www.caucho.com) seem the best alternatives.

The maxim "All logical differences are big differences," which is due to Wittgenstein, has served my colleague Hugh Darwen and myself very well as a guiding principle in database investigations over the years. It's also highly relevant to much of the material appearing elsewhere in the present book.

Figure 5-14. In this case, you can ignore warnings about package versions in official repositories. The exact version numbers of the packages, or the architecture suffix of amd64.deb, may be different on your machine. The important thing is that the library and application version numbers are the same; otherwise, the system complains. When gdebi has completed the installation of all relevant Synfig packages, you can start Synfig Studio using its entry on GNOME s Applications Graphics menu (see Figure 5-15).

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