Datenbanken Und SQL: Eine Praxisorientierte Einführung
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Datenbanken entstanden ab etwa 1960 aus der Notwendigkeit, die logischen auf die immer gr� er werdenden Datenmengen zu vereinfachen und Zugriffe zu normieren. Wurden diese Datenbanken �ber mehr als zwei Jahrzehnte hin- weg ausschlie lich auf Gro rechnern eingesetzt, so haben sie inzwischen ihren Siegeszug auch auf Kleinrechnern angetreten. Erm�glicht wurde dies aus dreierlei Gr�nden: erstens durch die enorm gestiegene Rechnerleistung der letzten Jahre, zweitens durch die Verwendung relationaler Datenbanken und drittens durch die Einf�hrung grafischer Oberfl�chen. Die Anfang der 70er Jahre entwickelten relationalen Datenbanken erm�gli- chen eine einfache Erstellung und Programmierung. Grafische Oberfl�chen unterst�tzen den Anwender und Datenbankdesigner dank einer leichten Benut- zerf�hrung und anschaulichen Musterbeispielen, so da auch dem interessier- ten Laien diese Form der Datenhaltung mit all ihren M�glichkeiten offen steht. Der Laie sei aber davor gewarnt, gr� ere Datenbanken ohne theoretische Grundkenntnisse selbst zu erstellen. Denn hier leitet sich der Datenbankent- wurf in der Regel nicht mehr direkt aus der AufgabensteIlung ab. Doch nur ein guter Entwurf garantiert �bersichtliche und optimale Zugriffe und erm�glicht je nach Bedarf Erg�nzungen und Erweiterungen der Datenbank. Auch wird nur dadurch die Konsistenz und Integrit�t der Datenbank erm�glicht, so da feh- lerhafte, widerspr�chliche und nicht mehr zugreifbare Datenbest�nde verhin- dert werden. Grundlagen zu Datenbankentwurf und -programmierung sollten f�r den Datenbankprogrammierer daher selbstverst�ndlich sein. Dieses Buch entstand aus mehreren Vorlesungen zu Datenbanken, die ich an der Fachhochschule Regensburg f�r Informatiker gelesen habe. Doch ich will auch denNicht-Informatiker und interessierten Laien gezielt ansprechen. Dazu wird mit zahlreichen Beispielen die Theorie direkt in die Praxis umgesetzt.
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