(SQL and Relational Theory: How to Write Accurate SQL Code) PDF Kostenlos ´ CJ Date

Road Non ti spiega un particolare GUSTO DI DB MA TI SPIEGA di DB ma ti spiega interrogarli in modo ragionato dandoti i dietro le uinteUn poco talebano su alcune scelte NULL in primis ma ottimo 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 fforts I thought Date s books would do it specially in light of the reviews I Ve Been Reading However The been reading However the writes with such abstract complexity though he tries and fails to make it seem down to arth 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 xample 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 scapes me so when I get into other areas of the book I am lost This is a major aspect of Date s Wish You Were Here: An Essential Guide to Your Favorite Music Scenes—from Punk to Indie and Everything in Between 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 adeuatexplanations 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 xplanationsI 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 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 wel. SL is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if you know how to put the theory into practice In this insightful book author CJ Date xplains relational theory in depth and demonstrates through numerous 5 Nights: Sinful Delights Boxed Set examples andxercises how you can apply it directly to your use of SLThis second The Seventh Witch 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 findmployees 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 avoided Why How 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 And the Miss Ran Away with the Rake 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 known for the bestselling textbook An Introduction to Database Systems Addison Wesley he has anxceptionally clear style when writing about complex principles and theor. SL and Relational Theory is devoted to relational theory and xplaining 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 is interesting but will left you with a felling that you have to stick to practices 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 while at the same time you will be aware of it s limitations in relational sense This can lead to 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 better 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 ffort I am not sure what the answer should be because it is hard to imagine how to xplain 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 He tries to very specific at almost ach aspect of the book and makes no space for misinterpretation The Color of Our Sky especially when it comes to the definitions Sometimes it seems to be little bit awkward thoughg 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 verything 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 vening 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 Obsession extend you knowledge in data modeling area I think you may find this book really comprehensive and interesting Masterful Excellent book ungeeignet f r Alle die nach Kochrezepten suchen um schnellin gegebenenes Pro. SL is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if you know how to put the theory into practice In this insightful book author CJ Date Cabaret: A Roman Riddle explains relational theory in depth and demonstrates through numerousxamples and xercises how you can apply it directly to your use of SLThis second dition 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 mployees 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 volved 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 known for the bestselling textbook An Introduction to Database Systems Addison Wesley he has an xceptionally clear style when writing about complex principles and theoryS. Blem l sen Dem Autor geht s um die Erkl rung des relationalen Modells dessen Unterst tzung die de facto Monopol Datenbanksprache SL inerseits nur unvollkommen leistet und andererseits auch nicht rzwingt 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 konzipiert haben Abweichungen von diesen Prinzipien sind nur in wenigen F llen gerechtfertigt und f hren selbst in moderat gro n Systemen schnell zu Schwierigkeiten denen sich die Betreiber derselben zumeist gar nicht bewusst sind CJ Date und H Darwen haben die Sprache Tutori 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 readIt 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 apply to real world problems His general approach is rather negative He really wants to show that SL products don implement relational theory correctly and are inherently broken He sounds like the whole world is mistaking but only him knows the truth it and is unfairly misunderstood He keeps using the same running xample a suppliers and parts database It s a simplistic The Mephisto Threat (Paul Tallis example with only three tables but he doesn t clearlyxplains what business problem this xample is intending to solve so I couldn t understand how he came up with that xample Tables and columns are named the old fashioned way using all uppercase abbreviation such S SNO PNO TY tc which obviously doesn t help to follow his xplanationsI ll leave two stars because the author obviously knows 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 The only problem I had was that it was technical than I needed Will come in handy down the. L is full of difficulties and traps for the unwary You can avoid them if you understand relational theory but only if you know how to put the theory into practice In this insightful book author CJ Date Just Cause explains relational theory in depth and demonstrates through numerousxamples and xercises how you can apply it directly to your use of SLThis second dition 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 mployees 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 volved 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 known for the bestselling textbook An Introduction to Database Systems Addison Wesley he has an xceptionally clear style when writing about complex principles and theory.

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