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William Aspray's Computing before computers PDF

By William Aspray

ISBN-10: 0813800471

ISBN-13: 9780813800479

Aspray W., members W. Aspray... et al. (eds.) Computing prior to desktops (Iowa kingdom college Press, 1990)(ISBN 0813800471)(600dpi)(T)(275s)

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J. 4 • Selectors • THE_ operators Regarding scalar types: A scalar type is one that has no user-visible components. Note carefully, however, that fairly complicated things can be scalar values! ) geometric points and line segments are legitimately regarded as scalar values. Make sure the students understand the difference between components of a type per se and components of a possible representation for a type. " Regarding possreps: The distinction between physical (or actual) and possible representations is much blurred in the industry (especially in SQL), but it really ought not to be.

Consider: DECLARE CURSOR C1 FOR SELECT S# FROM SP ORDER BY S# ... " stands for a FOR UPDATE clause -- excluded */ /* here because it isn't discussed in the chapter */ OPEN C1 ; FETCH C1 ... ; DELETE SP WHERE CURRENT OF C1 ; Which specific SP row is deleted? The standard doesn't say! (Specifically, it doesn't say it's the row the cursor is positioned on. ) Another point you should be aware of, though again I wouldn't mention it unless asked: SQL tables can have duplicate column names! S# FROM S, SP WHERE ...

The endpapers can help here (Figs. 5 are both repeated inside the back cover). BNF Notation Chapter 4 is the first in the book to use standard BNF notation, or rather a simple variant thereof. The variant in question──which isn't explained in detail in the book──is defined as follows: • Special characters and material in uppercase must be written exactly as shown. Material in lowercase enclosed in angle brackets "<" and ">" represents a syntactic category that appears on the left side of another production rule, and hence must eventually be replaced by specific items chosen by the user.

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Computing before computers by William Aspray


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