By William Aspray
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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This publication constitutes the completely refereed post-proceedings of the ninth overseas convention on Real-Time and Embedded structures and functions, RTCSA 2003, held in Tainan, Taiwan, in February 2003. The 28 revised complete papers and nine revised brief papers offered have been conscientiously reviewed and chosen for inclusion within the booklet.
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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.
Computing before computers by William Aspray