December 2024
Intermediate to advanced
272 pages
5h 48m
German
Content preview from SQL Schnelleinstieg - Datenbanken abfragen und verwalten in 14 Tagen
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Die Datenflut bezwingen – Daten mit dem WHERE-Befehl filtern
Mithilfe der Kombination aus dem SELECT- und FROM-Befehl können Sie bereits Tabellen und deren Spalten gezielt abfragen. Das war es dann aber auch schon. Tatsächlich macht sich diese Limitation besonders bei umfangreichen Datenbeständen schnell bemerkbar. Enthält eine Tabelle Tausende von Zeilen, so bläht sich die Ergebnismenge rasch ins Unermessliche auf und durch die schiere Datenflut geht der Überblick verloren. Zwar lässt sich diesem Effekt mithilfe des LIMIT-Befehls entgegenwirken, jedoch werden so nur willkürlich und ohne Kalkül Daten aus der Ergebnismenge entfernt.
Der WHERE
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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.
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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.