標(biāo)題: Titlebook: Nested Relations and Complex Objects in Databases; S. Abiteboul,P. C. Fischer,H. -J. Schek Conference proceedings 1989 Springer-Verlag Ber [打印本頁] 作者: 里程表 時(shí)間: 2025-3-21 16:12
書目名稱Nested Relations and Complex Objects in Databases影響因子(影響力)
書目名稱Nested Relations and Complex Objects in Databases影響因子(影響力)學(xué)科排名
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書目名稱Nested Relations and Complex Objects in Databases網(wǎng)絡(luò)公開度學(xué)科排名
書目名稱Nested Relations and Complex Objects in Databases被引頻次
書目名稱Nested Relations and Complex Objects in Databases被引頻次學(xué)科排名
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書目名稱Nested Relations and Complex Objects in Databases讀者反饋
書目名稱Nested Relations and Complex Objects in Databases讀者反饋學(xué)科排名
作者: 易受騙 時(shí)間: 2025-3-21 20:33 作者: 說明 時(shí)間: 2025-3-22 00:49 作者: 禁止 時(shí)間: 2025-3-22 05:00
Henry F. Korth,Mark A. Rothbout the values of bamboo being an important means of economic growth and for improving the socio-economic conditions of the rural poor.? Bamboo as an industrial material can substitute wood and that to at low978-981-10-9196-4978-981-10-0569-5Series ISSN 1614-9785 Series E-ISSN 2627-1516 作者: 單純 時(shí)間: 2025-3-22 11:48 作者: gait-cycle 時(shí)間: 2025-3-22 13:48 作者: breadth 時(shí)間: 2025-3-22 20:59
Volker Linnemannas planting material, instead of cuttings, necessitates wide spacing in nursery planting (1?×?1 m and 1,2?×?1,2 m). This should reduce the time between field planting of trees and letting cattle into the system without causing damage to the trees during the first and second years of plantation estab作者: humectant 時(shí)間: 2025-3-22 21:58
Yahiko Kambayashi,Tetsuya Furukawa,Hideki Yamamotoon. All these plant traits were correlated with species’ abundance and natural regeneration capacity. Under current practices, there is a risk of decrease in functional diversity of woody components and their capacity to deliver ecosystem services due to loss of species with a low regeneration capac作者: 柔軟 時(shí)間: 2025-3-23 01:45
Rudi Studer,Stefan B?rneregion, there is a predominance of goat production. As in the plains, the presence of legume species, mostly of the Fabaceae family, play a significant role in the diet of animals. Other non-leguminous species that are also consumed by domestic animals are ., ., ., ., ., . and palms, such as ., . and作者: 有權(quán)威 時(shí)間: 2025-3-23 06:32
Recursively defined complex objects, of objects, or certain object components..A final extension of the model supports database programming in the increasingly important area of . environments. For such applications, the respective recursive data model extension provides concepts for object distribution and inter-object communication 作者: ALTER 時(shí)間: 2025-3-23 09:56
Nested relations and recursive queries,ucture of a non first normal form relation. It is shown by examples that this method can be used to formulate queries which are rather cumbersome if only flat relations are used. Especially, in some cases the problem of performing a selection on a recursively defined relation disappears. This questi作者: 健談的人 時(shí)間: 2025-3-23 17:18
Conference proceedings 1989ch are incorporating features of models involving complex objects. A variety of approaches is represented in this volume. The first three papers give overviews of major pioneering implementation efforts. The fourth paper is devoted to the important issue of implementation of storage structures. The 作者: Irrigate 時(shí)間: 2025-3-23 19:59 作者: Confound 時(shí)間: 2025-3-23 22:55
Query languages for Nested Relational Databases,ussed and compared, SQL/NF, and Heidelberg Data Base Language (HDBL). Two extensions of these languages are considered. X-SQL/NF is a role-join extended version of SQL/NF that incorporates an ISA hierarchy into the semantics of the language. A recursive version of HDBL allows the definition of a transitive closure operation on nested relations.作者: 殺死 時(shí)間: 2025-3-24 04:41
An approach to manage large inheritance networks within a DBS supporting nested relations,ortance is the handling of the general graph structure provided by KL-ONE like formalisms within the tree structure offered by nested relations. The described approach is oriented towards the specific requirements which have to be met in a natural language processing environment.作者: MITE 時(shí)間: 2025-3-24 07:52
On the normalization in Nested Relational Databases,are structured with respect to a nonredundant set of data dependencies. The semantic differences between functional and multivalued dependencies are distinguished and incorporated in the design method. The properties of the nested normal form, and the other design methods for the nested normal form are also discussed.作者: Gustatory 時(shí)間: 2025-3-24 11:12 作者: acrimony 時(shí)間: 2025-3-24 18:22
,Four views of complex objects: A sophisticate’s introduction,modeling paradigms are: complex object types (including nested relations); semantic models; complex object models using object identifiers; and the model of the conceptual language Galileo. The presentation is largely informal, with a focus on philosophic issues.作者: abduction 時(shí)間: 2025-3-24 21:14 作者: 木訥 時(shí)間: 2025-3-25 01:29
On the uniqueness of nested relations, than K tuples is NP-complete. A template dependency is given as an essential integrity constraint to guarantee that a class of first normal form relations has unique nested relations with minimum number of tuples.作者: 包租車船 時(shí)間: 2025-3-25 04:29
,γ-Acyclic database schemes and nested relations,quivalent to nested relation schemes, and present an algorithm to restructure a γ-acyclic database scheme into a nested database scheme. This is desirable, since nested relations minimize redundancy and improve efficiency.作者: 決定性 時(shí)間: 2025-3-25 09:42 作者: Verify 時(shí)間: 2025-3-25 14:31 作者: Dungeon 時(shí)間: 2025-3-25 18:15
Realization of nested relation interfaces for relational and network databases,ween the user defined structure and the dependencies on the structure..(2) To find an efficient procedure to produce a nested relation when there is no contradiction..In this paper we will discuss the above two methods for relational and network databases.作者: 實(shí)現(xiàn) 時(shí)間: 2025-3-25 21:26 作者: 暗語 時(shí)間: 2025-3-26 04:06
Ralf H. Güting,Roberto Zicari species.One stop reference work for bamboo species in Asia.This monograph aims at bringing out a comprehensive collection of information on bamboo varieties in South Asia. The main focus of this book is to address the ecological and economic significance of bamboos..Bamboo is a versatile group of p作者: cushion 時(shí)間: 2025-3-26 04:54 作者: 使成核 時(shí)間: 2025-3-26 11:42
Henry F. Korth,Mark A. Roth species.One stop reference work for bamboo species in Asia.This monograph aims at bringing out a comprehensive collection of information on bamboo varieties in South Asia. The main focus of this book is to address the ecological and economic significance of bamboos..Bamboo is a versatile group of p作者: 勤勞 時(shí)間: 2025-3-26 13:24
Volker Linnemann) that integrate afforestation using deciduous species with cattle raising create diversified systems, which demand management practices to capitalise on the beneficial effects and to minimise negative impact on the environment. The increase in silvopastoral activity on Salicaceae plantations in the作者: 帶傷害 時(shí)間: 2025-3-26 19:35 作者: NOMAD 時(shí)間: 2025-3-27 00:14
Rudi Studer,Stefan B?rnerojedes, Barinas, Apure and Portuguesa in the Venezuelan Llanos and in the states of Lara, Falcon, Anzoategui, and Trujillo in the semi-arid life zones of the country. The main arrangements promoted are living fences, scattered trees in pastures, trees in rows, grazing in tree plantations and intensi作者: evanescent 時(shí)間: 2025-3-27 02:10 作者: FAST 時(shí)間: 2025-3-27 06:41 作者: Arboreal 時(shí)間: 2025-3-27 12:19 作者: 接合 時(shí)間: 2025-3-27 16:25 作者: Ligament 時(shí)間: 2025-3-27 17:51 作者: Flatter 時(shí)間: 2025-3-27 22:00 作者: 扔掉掐死你 時(shí)間: 2025-3-28 02:54
Recursively defined complex objects,ns. The basic idea is to allow for generalized, . definitions for complex object . which can be integrated in a high-level programming language type system..The underlying ‘recursive’ complex objects model allows for powerful and flexible means of representing hierarchically structured objects in an作者: cylinder 時(shí)間: 2025-3-28 09:41
Query languages for Nested Relational Databases,y to exploit the power of this model. First, formal query languages are considered: a relational calculus defining the desired power of nested relational languages, and a relational algebra that provides a procedural language suitable for query optimization. Next, two higher-level languages are disc作者: 倔強(qiáng)一點(diǎn) 時(shí)間: 2025-3-28 14:28 作者: 虛弱 時(shí)間: 2025-3-28 18:25
Realization of nested relation interfaces for relational and network databases,ition of a relation. Nested relation approach is another way to reduce such redundancy. Since all the facts are shown in one relation, this method is suitable for user interface. In order to get a proper nested relation, we must consider the form defined by the user as well as dependencies (in relat作者: 貪心 時(shí)間: 2025-3-28 19:26
An approach to manage large inheritance networks within a DBS supporting nested relations, of the knowledge base contents In this paper we present an approach for managing structured inheritance networks in an andvanced database system. Actually, we develop concepts for handling a KL-ONE like formalisms in an extended relational database system supporting nested relations. Of special imp作者: 歌劇等 時(shí)間: 2025-3-29 00:23
On the normalization in Nested Relational Databases,rity constraints we consider are functional and multivalued dependencies. We define a normal form for nested relations, called nested normal form, utilizing the functional and multivalued dependencies, and give an algorithm to a obtain such a database scheme. In the nested normal form the relations 作者: DEVIL 時(shí)間: 2025-3-29 06:24
Complex objects modeling: An entity-relationship approach,equently, either new models are developed, or existing ones are extended to better respond to this requirement. Current proposals in the latter category are mainly based on the relational approach (with, as major outcome, the NF. family of models) or on functional models like DAPLEX. This paper inte作者: 同音 時(shí)間: 2025-3-29 10:23 作者: travail 時(shí)間: 2025-3-29 15:03
978-3-540-51171-7Springer-Verlag Berlin Heidelberg 1989作者: 高度表 時(shí)間: 2025-3-29 18:18
Nested Relations and Complex Objects in Databases978-3-540-46175-3Series ISSN 0302-9743 Series E-ISSN 1611-3349 作者: BILL 時(shí)間: 2025-3-29 22:19 作者: CHAR 時(shí)間: 2025-3-30 03:47
https://doi.org/10.1007/3-540-51171-7database; database machine; information management; relational database作者: 憲法沒有 時(shí)間: 2025-3-30 06:06 作者: 詢問 時(shí)間: 2025-3-30 10:55 作者: reperfusion 時(shí)間: 2025-3-30 13:37
A data model for complex objects based on a semantic database model and nested relations,This paper presents an overview of a data model for complex objects called EXTREM (EXTended RElational Model). EXTREM is based on the semantic database model IFO [AbH.EXTREM is compared with other semantic database models. The EXTREM object algebra and user interfaces are briefly summarized.作者: Fracture 時(shí)間: 2025-3-30 17:11 作者: 不再流行 時(shí)間: 2025-3-31 00:09 作者: hedonic 時(shí)間: 2025-3-31 01:41 作者: 艱苦地移動 時(shí)間: 2025-3-31 06:56
Fima Klebaner,Robert Liptserurrent development of science and technology challenges the scientific community to provide innovative engineering solutions and encourages undertaking research on optimal solutions for mechatronic systems which include, inter alia, wheeled mobile robots and robotic manipulators. The issues relating作者: 秘傳 時(shí)間: 2025-3-31 11:53
res noch eine glühende Masse bildet, w?hrend das ?u?ere zu einer festen Schale, der ?Erdrinde“, geworden ist. Sie ist aus silikatischem Gesteinsmaterial (in erster Linie Silikatverbindungen der Leichtmetalle) zusammengesetzt und besitzt eine mittlere Dichte von 2,7. Ihre Dicke ist erstaunlich gering
