May 2013
Intermediate to advanced
700 pages
20h 7m
German
book
Abfragen von Microsoft SQL Server 2012 - Original Microsoft Training für Examen 70-461
by Itzik Ben-Gan, Dejan Sarka, Ron Talmage
Content preview from Abfragen von Microsoft SQL Server 2012 - Original Microsoft Training für Examen 70-461Become 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,
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.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.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.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.
Kapitel 5. Gruppen und Fenster
Prüfungsziele in diesem Kapitel:
Arbeiten mit Daten
Abfragen von Daten mithilfe von SELECT-Anweisungen
Einrichten von Unterabfragen
Einrichten von Aggregatabfragen
In diesem Kapitel geht es um Operationen zur Datenanalyse. Datenanalysefunktionen werden auf eine Menge von Zeilen angewendet und geben einen einzelnen Wert zurück. Ein Beispiel dafür ist die Aggregatfunktion SUM. Es gibt zwei Arten von Datenanalysefunktionen, nämlich Gruppen- und Fensterfunktionen. Sie unterscheiden sich darin, wie die Zeilenmenge definiert wird, auf der die Funktion operiert. Mit gruppierten Abfragen definieren Sie gruppierte Tabellen, um dann auf jede Gruppe eine Gruppenfunktion anzuwenden. Im anderen Fall legen Sie mit Fensterabfragen Fenstertabellen ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.