標題: Titlebook: Dependencies in Relational Databases; Bernhard Thalheim Textbook 1991 Springer Fachmedien Wiesbaden 1991 Datenbank.relationale Datenbank [打印本頁] 作者: Optician 時間: 2025-3-21 16:04
書目名稱Dependencies in Relational Databases影響因子(影響力)
書目名稱Dependencies in Relational Databases影響因子(影響力)學科排名
書目名稱Dependencies in Relational Databases網絡公開度
書目名稱Dependencies in Relational Databases網絡公開度學科排名
書目名稱Dependencies in Relational Databases被引頻次
書目名稱Dependencies in Relational Databases被引頻次學科排名
書目名稱Dependencies in Relational Databases年度引用
書目名稱Dependencies in Relational Databases年度引用學科排名
書目名稱Dependencies in Relational Databases讀者反饋
書目名稱Dependencies in Relational Databases讀者反饋學科排名
作者: Anguish 時間: 2025-3-21 23:57
Some Fundamentals of Dependency Theory, in their comprehension, and then their solution. Logic is just a formal system; many other formal systems have been proposed and applied to databases. In the axiomatic approach, a formal system relies upon an object language, semantics or interpretation of formulas in that language and a proof theory.作者: 拾落穗 時間: 2025-3-22 02:12
Dependencies in Relations with Null Values and Incomplete Informations,hat they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value exists but cannot be stored”, “value is not complete classified” etc. (14 different types of null values are well known /ANSI 75/).作者: 草率女 時間: 2025-3-22 05:19 作者: ingenue 時間: 2025-3-22 09:13 作者: 項目 時間: 2025-3-22 12:55
Erchimen Gavriliev,Tatiana Avdeenkohat they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value exists but cannot be stored”, “value is not complete classified” etc. (14 different types of null values are well known /ANSI 75/).作者: 項目 時間: 2025-3-22 18:09
Erchimen Gavriliev,Tatiana Avdeenkoerator, was formalized, using Codd-functional and multivalued dependencies. Such horizontal decompositions /DBPA 83/ are useful in the normalization of schemata in which hidden constraints are involved.作者: BILE 時間: 2025-3-23 00:48
Horizontal Decomposition Dependencies,erator, was formalized, using Codd-functional and multivalued dependencies. Such horizontal decompositions /DBPA 83/ are useful in the normalization of schemata in which hidden constraints are involved.作者: Nebulizer 時間: 2025-3-23 01:28 作者: MOTIF 時間: 2025-3-23 08:55 作者: constitutional 時間: 2025-3-23 09:54 作者: AXIOM 時間: 2025-3-23 14:56
?zgehan ?enyuva,Ramón Llopis-Goig. Codd’s relational algebra is a high-level language in which questions can be put simply and succinctly /CODD 72/. Concepts from relational algebra have been incorporated into the design of several new database query languages, into view conceptions and into the conception of internal database sche作者: 軟弱 時間: 2025-3-23 19:54 作者: Blasphemy 時間: 2025-3-24 01:43
https://doi.org/10.1007/978-3-031-58409-1re, the semantics in relational database schemata. Functional dependence is an important property of a relation. In a relation which verifies some functional dependency, there is a functional connection between the parts of tuples. Functional dependencies can be defined like functions f: X --> Y whi作者: Suggestions 時間: 2025-3-24 04:51 作者: attenuate 時間: 2025-3-24 06:43
Erchimen Gavriliev,Tatiana Avdeenkom of querying these so-called incomplete databases. In any real-world database, there will be entries having values that are “special”, in the sense that they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value 作者: 嚴厲批評 時間: 2025-3-24 13:53
Erchimen Gavriliev,Tatiana Avdeenkotroduction in /CODD 72/. The use of vertical decompositions always requires some constraints to be satisfied, for instance a join dependency or a functional dependency, in order to be able to regain the original relation by taking the join of its projections. In /ARDE 80/, /THAL 84/ and AABM 80/ the作者: Euthyroid 時間: 2025-3-24 15:21 作者: cumulative 時間: 2025-3-24 22:51
Dependencies in Relational Databases978-3-663-12018-6Series ISSN 0138-502X 作者: cochlea 時間: 2025-3-24 23:32
0138-502X Overview: 978-3-663-12019-3978-3-663-12018-6Series ISSN 0138-502X 作者: Keratectomy 時間: 2025-3-25 04:13
https://doi.org/10.1007/978-3-031-58409-1re, the semantics in relational database schemata. Functional dependence is an important property of a relation. In a relation which verifies some functional dependency, there is a functional connection between the parts of tuples. Functional dependencies can be defined like functions f: X --> Y which are mappings satisfying the conditions:作者: resuscitation 時間: 2025-3-25 11:19 作者: FACT 時間: 2025-3-25 13:14 作者: 委屈 時間: 2025-3-25 18:55 作者: 易于出錯 時間: 2025-3-25 21:24
Functional Dependencies,re, the semantics in relational database schemata. Functional dependence is an important property of a relation. In a relation which verifies some functional dependency, there is a functional connection between the parts of tuples. Functional dependencies can be defined like functions f: X --> Y which are mappings satisfying the conditions:作者: 概觀 時間: 2025-3-26 02:07 作者: 合法 時間: 2025-3-26 06:27 作者: 枯燥 時間: 2025-3-26 10:50 作者: MOTTO 時間: 2025-3-26 14:28 作者: 勛章 時間: 2025-3-26 17:02
Ba?ak Alpan,Albrecht Sonntag,Katarzyna Herdly utilized for databases, they only recently were subject of theoretical investigations. Their expressive power is not utilized yet. They could, for instance, play a more important role in management of distributed databases (replication).作者: 古文字學 時間: 2025-3-26 21:45 作者: 創(chuàng)造性 時間: 2025-3-27 04:30
Database Schemes and Databases, the theory of abstract data types /REI 84/ and especially the approach of /PDGG 88/, /VOSS 87/ and /DEAB 85/. The underlying concept used in the relational model is the same as that used to define a mathematical relation (in set theory and algebra). Simply, a relation is a subset of the Cartesian p作者: 能量守恒 時間: 2025-3-27 08:24 作者: Painstaking 時間: 2025-3-27 12:48 作者: 后退 時間: 2025-3-27 17:16 作者: 連接 時間: 2025-3-27 17:48
Inclusion Dependencies,whether they are designed properly. Much less is known about how the relations should fit together. In general, an inclusion dependency (IND) is of the form.where R and S are predicates (or relation scheme names), and the A.’s and B.’s are attributes of the corresponding schemes. The inclusion depen作者: ANTIC 時間: 2025-3-27 22:10
Dependencies in Relations with Null Values and Incomplete Informations,m of querying these so-called incomplete databases. In any real-world database, there will be entries having values that are “special”, in the sense that they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value 作者: 壁畫 時間: 2025-3-28 04:30
Horizontal Decomposition Dependencies,troduction in /CODD 72/. The use of vertical decompositions always requires some constraints to be satisfied, for instance a join dependency or a functional dependency, in order to be able to regain the original relation by taking the join of its projections. In /ARDE 80/, /THAL 84/ and AABM 80/ the作者: municipality 時間: 2025-3-28 06:56
The Relationship between Dependency Classes, papers on dependency theory are given. By some authors it was noticed that dependency theory is in a chaotic state. This book should be understood as an attempt to present the most important results on dependency theory. The usefulness of such a great number of different constraints is an open prob作者: cuticle 時間: 2025-3-28 12:59 作者: 內閣 時間: 2025-3-28 17:34 作者: 哥哥噴涌而出 時間: 2025-3-28 19:19
Remote Sensing Application978-981-19-0213-0Series ISSN 2199-5974 Series E-ISSN 2199-5982 作者: Colonnade 時間: 2025-3-29 01:10
Mine Akbas,Songul Kaya,Leo RebholzAus der Zeit des Barock lassen sich nur ganz wenige ethische Spuren in Lists Werken nachweisen. Dabei handelt es sich um Samuel Freiherr v. Pufendorf (1632-1694) und Gottfried Wilhelm Leibniz (1646-1716).
