The problem of incomplete information in relational databases
In a relational database the information is recorded as rows in tables. However, in many practical situations the available information is incomplete and the values for some columns are missing. Yet few existing database management systems allow the user to enter null values in the database. This mo...
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| Tác giả chính: | |
|---|---|
| Định dạng: | Livre numérique |
| Ngôn ngữ: | Anglais |
| Được phát hành: |
Berlin [etc.] :
Springer
[20..].
Cham : Springer Nature |
| Loạt: | Lecture notes in computer science
554 |
| Những chủ đề: | |
| Truy cập trực tuyến: | Accès sur la plateforme de l'éditeur Accès sur la plateforme Istex Accès Université d'Orléans Accès INSA CVL |
| Chú thích: |
Archives Springer e-books (Licence nationale) Archives Springer e-books (Licence nationale) |
| Autres localisations: | Voir dans le Sudoc |
| Edition sous un autre format: | • The problem of incomplete information in relational databases, G. Grahne, 1991, Berlin, Springer, 1 vol. (VIII-156 p.), Lecture notes in computer science, 3-540-54919-6 • The Problem of Incomplete Information in Relational Databases, Texte imprimé, 9783662207529 |
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| 100 | 1 | |a Grahne, Gösta, |d 1955- | |
| 245 | 1 | 0 | |a The problem of incomplete information in relational databases |c G. Grahne. |
| 260 | |a Berlin [etc.] : |b Springer. | ||
| 260 | |a Cham : |b Springer Nature, |c [20..]. | ||
| 490 | 0 | |a Lecture notes in computer science |v 554 |x 1611-3349 | |
| 500 | |a Archives Springer e-books (Licence nationale) | ||
| 500 | |a Archives Springer e-books (Licence nationale) | ||
| 505 | 0 | |a Relational databases -- Semantic aspects of incomplete information -- Syntactic and algorithmic aspects of incomplete information -- Computational complexity aspects of incomplete information -- Some conclusive aspects. | |
| 506 | |a Accès en ligne pour les établissements français bénéficiaires des licences nationales | ||
| 506 | |a Accès soumis à abonnement pour tout autre établissement | ||
| 506 | |a Conditions particulières de réutilisation pour les bénéficiaires des licences nationales. https://www.licencesnationales.fr/springer-nature-ebooks-contrat-licence-ln-2017 | ||
| 520 | |a In a relational database the information is recorded as rows in tables. However, in many practical situations the available information is incomplete and the values for some columns are missing. Yet few existing database management systems allow the user to enter null values in the database. This monograph analyses the problems raised by allowing null values in relational databases. The analysis covers semantical, syntactical, and computational aspects. Algorithms for query evaluation, dependency enforcement and updates in the presence of null values are also given. The analysis of the computational complexity of the algorithms suggests that from a practical point of view the database should be stored as Horn tables, which are generalizations of ordinary relations, allowing null values and Horn clause-like restrictions on these null values. Horn tables efficiently support a large class of queries, dependencies and updates. | ||
| 650 | |a Informatique | ||
| 650 | |a Algorithmes | ||
| 650 | |a Intelligence artificielle | ||
| 650 | |a Bases de données relationnelles | ||
| 776 | 0 | |0 02226969X |t The problem of incomplete information in relational databases |f G. Grahne |d 1991 |c Berlin |n Springer |p 1 vol. (VIII-156 p.) |s Lecture notes in computer science |z 3-540-54919-6 | |
| 776 | 0 | |t The Problem of Incomplete Information in Relational Databases |b Texte imprimé |z 9783662207529 | |
| 856 | 4 | |q PDF |u https://doi.org/10.1007/3-540-54919-6 |z Accès sur la plateforme de l'éditeur | |
| 856 | 4 | |u https://revue-sommaire.istex.fr/ark:/67375/8Q1-FSKH9M0L-7 |z Accès sur la plateforme Istex | |
| 856 | 4 | |5 452349901:747913854 |u https://ezproxy.univ-orleans.fr/login?url=https://doi.org/10.1007/3-540-54919-6 |z Accès Université d'Orléans | |
| 856 | 4 | |5 180339901:750926627 |u https://ezproxy.insa-cvl.fr/login?qurl=https://doi.org/10.1007/3-540-54919-6 |z Accès INSA CVL | |
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