October 2020
Intermediate to advanced
368 pages
9h 1m
German
Content preview from Datenbanken -- Kompaktkurs
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5
Normalisierung für eine redundanzfreie Datenbank
Die Normalisierung ist ein Teilschritt des Datenbankentwurfs für das relationale Datenbankmodell. Die Normalisierung ist zum Verfeinern des logischen Entwurfs gedacht, dessen ersten Schritt wir im letzten Kapitel mit der Abbildung eines Datenbankschemas in einem Entwurfsmodell (dem ER-Modell) auf ein Datenbankschema in einem Realisierungsmodell (dem relationalen Datenbankmodell) durchgeführt haben. Ziel ist nun noch die Vermeidung von Redundanzen durch Aufspalten von Relationenschemata, ohne gleichzeitig
• semantische Informationen zu verlieren (dieses Kriterium wird als Abhängigkeitstreue eingeführt)
• und die Möglichkeit zur Rekonstruktion der Relationen zu verlieren (dieses Kriterium wird ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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