A First Course in Database Systems by Jeffrey D. Ullman, Jennifer Widom

By Jeffrey D. Ullman, Jennifer Widom

<P style="MARGIN: 0px" soNormal></B> Written through recognized computing device scientists, this obtainable and succinct creation to database structures makes a speciality of database layout and use. It presents in-depth assurance of databases from the viewpoint of the database fashion designer, consumer, and alertness programmer. <B> The authors supply an outline of significant programming platforms (e.g., SQL, JDBC, PSM, CLI, Hypertext Preprocessor, XQuery, etc.) and the highbrow framework to place them into context.  For software program engineers, database engineers, and programmers.

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3 Goodman, The Structure of Appearance, p. 362. 29 Ambiguity in language Elementary ambiguity will also be distinguishable from vagueness, where the latter is taken to involve a certain indeterminacy or ambivalence in deciding the applicability of a term to an object. For x, within D, may be unambiguous and yet vague relative to some object o, all its replicas within D being alike indeterminate respecting o. Conversely, x and y may be ambiguous with respect to one another within D, neither displaying vagueness relative to any o within our domain of consideration.

Philosophical disputes as to whether some critical term, for example, "exists," should be construed as ambiguous, or merely general, hinge on theoretical considerations. The problem of settling the construction of a term for special theoretical purposes is different, however, from that of judging the issue of ambiguity versus generality as affecting ordinary terms within given discourses. At any rate, the purport of even the philosophical issue may be clarified by the distinction. 3 Goodman, The Structure of Appearance, p.

But the question that concerns us here is this: Given indivisible replicas with identical primary extensions, does the elementary ambiguity of their shared secondary extension contribute a new form of derivative ambiguity to the original replicas? The "rose" example, to be sure, does not highlight this problem, but the examples introduced in the present section do raise the issue. The "greencentaur-picture" tokens, the "Algernon-description" tokens, the "Linusdescription" tokens, and the "Argus-description" tokens display elementary ambiguity in spite of the lack of elementary ambiguity of their respective constituents.

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A First Course in Database Systems by Jeffrey D. Ullman, Jennifer Widom
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