June 2010
Intermediate to advanced
900 pages
23h 11m
German
Content preview from Microsoft Access 2010 - Das HandbuchBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Zusammenfassung
In diesem Kapitel haben wir uns mit den Beziehungen zwischen Tabellen befasst. Diese sind gerade in einer relationalen Datenbank wichtig, weil sonst fehlerhafte Inhalte möglich sind.
Es gibt drei verschiedene Arten von Beziehungen zwischen zwei Tabellen:
1:n-Beziehungen („Beziehungen“) mit einem hierarchischen Zusammenhang zwischen den Daten. Zu jedem Datensatz in der Mastertabelle gibt es keinen, einen oder viele Datensätze in der Detailtabelle.
1:1-Beziehungen („1:1-Beziehung“), die vor allem der Trennung von Daten eines ursprünglich einzigen Datensatzes dienen. Zu jedem Datensatz in der Mastertabelle gibt es keinen oder maximal einen Datensatz in der Detailtabelle.
m:n-Beziehungen („m:n-Beziehung“), die sich in Access gar nicht ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.