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CHAPTER 28 AN OVERVIEW AND ANALYSIS OF PROPOSALS BASED ON THE TSQL2 APPROACH
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12. Richard T. Snodgrass (ed.): The TSQL2 Temporal Query Language. Norwell, Mass.: Kluwer Academic Publishers (1995). 13. Richard T. Snodgrass, Michael H. B hlen, Christian S. Jensen, and Andreas Steiner: Adding Valid Time to SQL/Temporal and Adding Transaction Time to SQL/Temporal, Madrid, Spain (January 1997); ftp://sqlstandards.org/SC32/WG3/Meetings/MAD_1997_01_ Madrid_ESP/mad146.ps. 14. Richard T. Snodgrass, Michael H. B hlen, Christian S. Jensen, and Andreas Steiner: Transitioning Temporal Support in TSQL2 to SQL3, in reference [7]. 15. Richard T. Snodgrass: Developing Time-Oriented Database Applications in SQL. San Francisco, Calif.: Morgan Kaufmann (2000). The following remarks on temporal database design are taken from this reference (we find them interesting inasmuch as they describe an approach that is diametrically opposite to that advocated in reference [6]): In the approach that we espouse here, conceptual design initially ignores the time-varying nature of the applications. We focus on capturing the current reality and temporarily ignore any history that may be useful to capture. This selective amnesia somewhat simplifies what is often a highly complex task of capturing the full semantics ... An added benefit is that existing conceptual design methodologies apply in full ... Only after the full design is complete do we augment the ER [= entity/relationship] schema with ... time-varying semantics ... Similarly, logical design proceeds in two stages. First, the nontemporal ER schema is mapped to a nontemporal relational schema, a collection of tables ... In the second stage, each of the [temporal annotations on the otherwise nontemporal ER schema] is applied to the logical schema, modifying the tables or integrity constraints to accommodate that temporal aspect.
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APPENDIX
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The Role of the Trade Press in Educating the Professional Community: A Case Study
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If you think education is expensive, consider the alternative. Anon. f this book has an overriding theme, it is that the database community in general is in desperate need of more and better education indeed, it has been so ever since its inception. This appendix, first written in 1993 and substantially revised in 2000, is, sadly, all too relevant to that theme.
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During the summer of 1993, a series of items appeared in the trade paper (or journal) Computerworld on the general topic of relational vs. object-oriented database management. The chronology of events was as follows. 1. First of all, at the request of Fabian Pascal (who was writing an article for inclusion in a forthcoming special Object-Oriented Programming feature issue of Computerworld), I wrote a short position paper entitled Relational vs. Object-Oriented: Not an Either/Or Decision (final draft dated March 12th, 1993). The idea was for that position paper to accompany Fabian s piece, thereby lending additional weight to the arguments he was propounding in his own article. The intent behind my paper (as with most of the technical material I write) was primarily to educate: more specifically, to try to introduce some clear thinking into an area where most discussions still seemed to suffer from the more heat than light syndrome. The original draft of that paper is included in this appendix as Exhibit A.
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APPENDIX THE ROLE OF THE TRADE PRESS IN EDUCATING THE PROFESSIONAL COMMUNITY
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2. Computerworld chose not to publish my paper as written, but instead published an edited and abbreviated version, with a different title ( A Fruitful Union ). While the editing which was done without any consultation with myself, I might add did not significantly change the message of the original draft, it did omit a few key points and it did alter the emphasis in some of what remained. (It also introduced some pretty slipshod writing, but let that pass.) That edited version, which appeared in the June 14th, 1993, issue of Computerworld, is included herein as Exhibit B. 3. Two weeks later (June 28th, 1993), Computerworld s technical editor Charles Babcock commented on the same subject in his regular Computerworld column, under the heading Relational Backlash. His comments, it seemed to me, were definitely in the more heat than light category a fact I found both sad and rather annoying, given (a) my own position as stated in print, with supporting arguments, in his own newspaper only two weeks previously, and given also (b) the responsibility, as I see it, of writers in influential positions such as Babcock s to do their best to educate their readers instead of pandering to a taste, real or perceived, for controversy. Babcock s article is reproduced as Exhibit C. 4. On June 29th, 1993, in response to Babcock s article, I wrote a letter to the editor of Computerworld, which was published in abbreviated form on July 12th, 1993. Exhibit D is the letter as originally written, Exhibit E is the version that was published. 5. The published version of the letter provoked a somewhat shrill response from a reader (Donald Burleson, Computerworld, August 2nd, 1993). I leave it to readers of this appendix to note how the omissions from my original paper and from my letter enabled Burleson to make some of the comments he did. Burleson s letter (at least as published probably his original was edited too) is attached as Exhibit F. 6. I wrote a reply to Burleson s letter and sent it with a cover note to the editor of Computerworld (August 2nd, 1993). That letter was never published, nor even acknowledged. See Exhibit G. 7. Subsequently, another response to Babcock s column and to my July 12th letter was published (James Barnett, Computerworld, August 23rd, 1993). Comments similar to those under paragraph 5 above apply here also. See Exhibit H. 8. I wrote a reply to Barnett s letter and sent it with a cover note to the editor of Computerworld (August 24th, 1993). As with my August 2nd letter, that letter was neither published nor acknowledged. See Exhibit I.
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