June 2010
Intermediate to advanced
900 pages
23h 11m
German
Content preview from Microsoft Access 2010 - Das Handbuch
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Inner Join und Outer Join
Auch wenn die Bezeichnungen Left Join und Right Join schon ein paar Mal aufgetaucht sind, sollten wir uns doch noch einmal ausführlich mit ihnen beschäftigen. Beide zusammen werden gelegentlich als Outer Join bezeichnet, im Gegensatz zum Inner Join, der ja auch ein SQL-Schlüsselwort ist.
An dieser Stelle ist auch ein Blick in die Mengenlehre hilfreich, denn so lässt sich grafisch sehr anschaulich beschreiben, welche Daten gerade angezeigt werden. Die beiden beteiligten Tabellen können Sie sehr allgemein als Tabelle A und Tabelle B wie in Abbildung 20.9 bezeichnen.
Abbildung 20.9 Die beiden Kreise symbolisieren die Tabellendaten ...
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