June 2009
Beginner to intermediate
428 pages
9h 48m
German
Content preview from Data Mining mit Microsoft SQL Server
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2.1. Daten- und Inhaltstypen
Datentypen geben Auskunft über die Beschaffenheit der Werte von Attributen. SQL Server Analysis Services unterstützen die folgenden Datentypen: Text, Long (ganzzahliger Wert), Boolean (Wahrheitswert), Double (Fließkommazahl), Date (Datum). Werden Daten einer vorhandenen Datenbanktabelle oder eines Cubes analysiert, werden die Datentypen der Attribute aus diesen Strukturen abgeleitet – der Anwender muss sich in diesem Fall damit nicht belasten. Weiterführende Informationen zu Datentypen können der Online-Dokumentation entnommen werden.
Neben Informationen über die vorherrschenden Datentypen benötigen Miningalgorithmen auch Informationen über das Verhalten der vorliegenden Attribute. Deswegen ist der Anwender angehalten, ...
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