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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Verschachteln von Datenbankabfragen und Datenmanipulation
Noch ist die Reise in die Welt der SQL-Abfragen nicht zu Ende. Ein paar letzte Grundlagen sind verblieben, welche es in diesem und im nächsten Kapitel zu durchforsten gilt. Den Anfang machen dabei die Subqueries bzw. die Unterabfragen. Tatsächlich stellen JOINs nämlich nicht die einzige Möglichkeit dar, um die Informationen mehrerer Tabellen zu vereinen. Neben dieser neuen Technik werden in den weiteren Abschnitten Funktionen zum Manipulieren von einzelnen Werten durchleuchtet.
7.1 Komplexe Abfragen mittels Unterabfragen erstellen
Wie in der Einleitung des Kapitels schon angedeutet, existiert ...
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