File:Assoziativ und Hierarchisch.jpg
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DescriptionAssoziativ und Hierarchisch.jpg |
Deutsch: Schematische Darstellungen unterschiedlicher Datenmodelle.
Die Knoten des Graphen stellen die internen Tabellen des Datenmodells und die Kanten zwischen den Knoten die Verbindungen zwischen Schlüsselfeldern der jeweiligen Tabellen dar. Links: Das assoziative Modell. Verbindungen zwischen Datenquellen sind nicht gerichtet und können von jedem Knoten über die jeweiligen Kanten zu einem anderen Knoten hergestellt werden Rechts: Das hierarchische Modell. Unterknoten sind nur vom Wurzelknoten oben zu erreichen. Verbindungen von einem Unterknoten zu einem weiteren Unterknoten gleicher hierarchischer Ebene sind nicht möglich |
Date | |
Source | Own work |
Author | Alexander.Resch |
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current | 08:40, 13 September 2018 | 1,858 × 636 (58 KB) | Alexander.Resch (talk | contribs) | User created page with UploadWizard |
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13 September 2018
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9a3f8d7deda8f397bf59d94ac85660105472dd06
59,065 byte
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1,858 pixel
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