(PDF KINDLE) [SQL and Relational Theory: How to Write Accurate SQL Code] Ü CJ Date

Abstract aspects of the relational model Date purports to do that but he failed with meI am not sure what to recommend about this book but it seems clear to me that any reader should start out with a fairly firm understanding of the mathematics of set theory and how the relational model fits into that Then one should read Date with a bit of care because although I am sure he tries to write with insight and clarity I don t think he succeeds very well Non ti spiega un particolare gusto di DB ma ti spiega come interrogarli in modo ragionato dandoti i dietro le uinteUn poco talebano su alcune scelte NULL in primis ma ottimo Masterful Excellent book SL and Relational Theory is devoted to relational theory and explaining why SL is not relationally complete Author will guide you through various topics from the relational modeling and show how SL is limited in a way At some point this is interesting but will left you with a felling that you have to stick to practices derived from particular implementation of the SL while at the same time you will be aware of it s limitations in relational sense This can lead to the increase of the anger level towards your database vendorWhen I was reading the book there was one thing that bothered me all the time CJ introduces Tutorial D language which is let s say bothered me all the time CJ introduces Tutorial D language which is let s say suited for relation modeling than SL is I can agree with CJ here but uestion is whether learning yet another language just for the tutorial purpose is worth the effort I am not sure what the answer should be because it is hard to imagine how to explain some of the topics without any language at allWhen you read the book you can definitely tell that CJ has mathematical background He tries to be very specific at almost each aspect of the book and makes no space for misinterpretation especially when it comes to the definitions Sometimes it seems to be little bit awkward though eg see the definition of comma separated list This has it s advantages and disadvantages At some point you can be sure what author meant to say while at the same time the language of the book has this special scientific feeling I personally am the very fan of Wittgenstein s thesis that everything you want to say can be said simply Anyway bear in mind that the book is theoretical rather than pragmaticWhile I value the content of the book I can t say I read it cover to cover over just one evening holding my breath This book has academic style lots of condensed information and it doesn t suit me On the other hand the topic itself is neither a fiction Summarizing If you are looking for a book that will teach you SL a gentle way Don t buy it However if you are aware of the relational theory if you are looking for a theoretical background and want to extend you nowledge in data modeling area I think you may find this book really comprehensive and interesting. SL is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if you The Origin of Feces know how to put the theory into practice In this insightful book author CJ Date explains relational theory in depth and demonstrates through numerous examples and exercises how you can apply it directly to your use of SLThis second edition includes new material on recursive ueries “missing information” without nulls new update operators and topics such as aggregate operators grouping and ungrouping and view updating If you have a modest to advanced background in SL you’ll learn how to deal with a host of common SL dilemmas Why is proper column naming so important Nulls in your database are causing you to get wrong answers Why What can you do about it Is it possible to write an SL uery to find employees who have never been in the same department for than six months at a time SL supports “uantified comparisons” but they’re better avoided Why How do you avoid them Constraints are crucially important but most SL products don’t support them properly What can you do to resolve this situationDatabase theory and practice have evolved since the relational model was developed than 40 years ago SL and Relational Theory draws on decades of research to present the most up to date treatment of SL availableCJ Date has a stature that is uniue within the database industry A prolific writer wellnown for the bestselling textbook An Introduction to Database Systems Addison Wesley he has an exceptionally clear style when writing about complex principles and theor. ,


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Cht wird an Hand dieser Darstellung verstehen wie man auch in Ansi SL fast alle Aspekte umsetzen Redeeming the Republic Federalists Taxation and the Origins of the Constitution kann um eine einwandfreie Anwendung zu erstellen und die zahlreichen Fallen vermeidenann die in der blinden Verwendung von SL lauern Gem Einsteins Credo dass man Probleme so einfach wie m glich aber nicht einfacher darstellen sollte hat CJ Date hier gute Arbeit geleistet Wer an Kochrezepten interessiert ist wie man ein gegebenes Problem auf einer gegeben Datenbank mit den Mitteln des nativen SL Dialekts am performantesten oder elegantesten L sen ann ist hier an der falschen Adresse Dieses Buch erkl rt die Prinzipien relationaler Datenhaltung unnd die Funktion relationaler Operatoren im Detail und dabei ist es in der Pr zision der Darstellung den Werken aller anderen Autoren zu diesem Thema berlegen Wer das genau verstehen und sich die damit verbunde M he machen m chte wird hier allerbestens bedient Wer einfache Beispiele sucht wie man dieses oder jenes praktische Problem auf eine onkreten Datenbank uick und dirty l sen Plato and Parmenides: Parmenides' Way of Truth and Plato's Parmenides kann der Titel nnte hier falsche Vorstellungen hervorrufen sollte besser zu einem der unz hligen B cher greifen die es f r diesen Kundenkreis gibt I am plowing my way through this book and I must say that it appears to be impressive from an abstract mathematical point of view but I don t understand it I have been programming with PHPMySL for a few years getting along ok but in need of some theory behind my efforts I thought Date s books would do it especially in light of the reviews I ve been reading However the author writes with such abstract complexity though he tries and fails to make it seem down to earth that I have to read and reread and reread and reread the same sentence just to get some sense of what he is trying to sayFor example Date defines an interesting term relvar which stands for relation variable He goes into some detail about how that is distinguished from a relation value a relation a table and other terms After reading it all I thought I understood what a relvar was Turns out that there is some distinction between relvar and relation or relation value that still escapes me so when I get into other areas of the book I relation or relation value that still escapes me so when I get into other areas of the book I lost This is a major aspect of Date s explanations of the relational model yet I cannot grasp the subtleties that he finds fundamental and apparently obvious What a messDate reuires precision in the definition of terms and I understand that from a philosophical point of view However he does not go through adeuate explanations of those definitions at least from my point of view Yet he then proceeds to use those terms rather casually assuming the reader understands his rather obtuse and insufficient explanationsI need a book to walk me through the intricate differences between the practical tasks of programming with a particular system such as MySL and the corresponding. L is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if you now how to put the theory into practice In this insightful book author CJ Date explains relational theory in depth and demonstrates through numerous examples and exercises how you can apply it directly to your use of SLThis second edition includes new material on recursive ueries “missing information” without nulls new update operators and topics such as aggregate operators grouping and ungrouping and view updating If You Have A Modest To have a modest to background in SL you’ll learn how to deal with a host of common SL dilemmas Why is proper column naming so important Nulls in your database are causing you to get wrong answers Why What can you do about it Is it possible to write an SL uery to find employees who have never been in the same department for than six SL uery to find employees who have never been in the same department for than six at a time SL supports “uantified comparisons” but they’re better avoided Why How do you avoid them Constraints are crucially important but most SL products don’t support them properly What can you do to resolve this situationDatabase theory and practice have evolved since the relational model was developed than 40 years ago SL and Relational Theory draws on decades of research to present the most up to date treatment of SL availableCJ Date has a stature that is uniue within the database industry A prolific writer well nown for the bestselling textbook An Introduction to Database Systems Addison Wesley he has an exceptionally clear style when writing about complex principles and theory. ,

The only problem I had was that it was technical than I needed Will come in handy down the road Be aware that this book is not formatted like other O Reilly books Fonts are very small and text lines are very long which makes it physically unpleasant to are very small and text lines are very long which makes it physically unpleasant to s written in a very old fashioned and verbose way Things that could be written in a few words take several sentences The author uses a lot of parenthesis asides and foot notes so the text doesn t flow nicely you constantly have to switch between different levels of importance I couldn t read it beyond the fourth chapter I did learn a few relational concepts but the author fails to show how that can apply to real world problems His general approach is rather negative He really wants to show that SL products don t implement relational theory correctly and
ARE INHERENTLY BROKEN HE SOUNDS LIKE 
inherently broken He sounds like whole world is mistaking but only him With Krishna's Eyes knows the truth it and is unfairly misunderstood Heeeps using the same running example a suppliers and parts database It s a simplistic example with only three tables but he doesn t clearly explains what business problem this example is intending to solve so I couldn t understand how he came up with that example Tables and columns are named the old fashioned way using all uppercase abbreviation such S SNO PNO TY etc which obviously doesn t help to follow his explanationsI ll leave two stars because the author obviously nows his stuff and if you have a lot of spare time and patience you might be able to read this book from cover to cover and maybe get some value out of it Please reply to this comment if you feel that I m missing something ungeeignet f r Alle die nach Kochrezepten suchen um schnell ein gegebenenes Problem l sen Dem Autor geht es um die Erkl rung des relationalen Modells dessen Unterst tzung die de facto Monopol Datenbanksprache SL einerseits nur unvollkommen leistet und andererseits auch nicht erzwingt weshalb die meisten Datenbanken in der Praxis nicht den Prinzipien gen gen nach denen die V ter dieses Modells zu denen neben CF Codd auch der Autor CJ Date geh rt diese Art der Datenhaltung onzipiert haben Abweichungen von diesen Prinzipien sind nur in wenigen F llen gerechtfertigt und f hren selbst in moderat gro en Systemen schnell zu Schwierigkeiten denen sich die Betreiber derselben zumeist gar nicht bewusst sind CJ Date und H Darwen haben die Sprache Tutorial D Yoga in the Workplace konzipiert welche das relationale Modell besser unterst tzt vor allem aber vollst ndig realisiert Der Autor gibt eine pr zise Beschreibung des relationalen Modells das hat er auch in mehreren anderen B chern getan das vorliegende ist jedoch der bis dato letzte Stand und dazu ist Tutorial D in der Tat eine geeignete Sprache die man dann leider auch lernen muss um die Feinheiten und die Unterschiede zu falsch verwendetem SL zu verstehen Wer sich diese M he ma. SL is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if younow how to put the theory into practice In this insightful book author CJ Date explains relational theory in depth and demonstrates through numerous examples and exercises how you can apply it directly to your use of SLThis second edition includes new material on recursive ueries “missing information” without nulls new update operators and topics such as aggregate operators grouping and ungrouping and view updating If you have a modest to advanced background in SL you’ll learn how to deal with a host of common SL dilemmas Why is proper column naming so important Nulls in your database are causing you to get wrong answers Why What can you do about it Is it possible to write an SL uery to find employees who have never been in the same department forthan six months at a time SL supports “uantified comparisons” but they’re better avoided Why How do you avoid them Constraints are crucially important but most SL products don’t support them properly What can you do to resolve this situationDatabase theory and practice have evolved since the relational model was developedthan 40 years ago SL and Relational Theory draws on decades of research to present the most up to date treatment of SL availableCJ Date has a stature that is uniue within the database industry A prolific writer well nown for the bestselling textbook An Introduction to Database Systems Addison Wesley he has an exceptionally clear style when writing about complex principles and theoryS. SQL and Relational Theory: How to Write Accurate SQL Code