September 2024
Intermediate to advanced
840 pages
23h 27m
German
Content preview from SQL in a Nutshell, 4. Auflage
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Kapitel 4. Deine Daten lesen
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In diesem Kapitel werden wir die wichtigsten SQL-Anweisungen und -Klauseln kennenlernen, die du brauchst, um Informationen aus deiner Datenbank zu extrahieren. Du lernst die grundlegende Anweisung SELECT und die verschiedenen Unterklauseln kennen, die du verwenden kannst, um Daten auszuwählen und zu Zwischensummen zu aggregieren. Am Ende dieses Kapitels wirst du die Konzepte von JOIN Operationen, SET Operationen, Aggregation, Fensteroperationen, allgemeinen Tabellenausdrücken und Unterabfragen verstehen. Du wirst auch wissen, wie du diese effektiv kombinieren kannst, um beliebige Daten in den zentralen Datenbankplattformen abzufragen.
Wie dieses Kapitel zu verwenden ist
Wenn du einen Befehl in diesem Kapitel recherchierst:
Überprüfe Tabelle 4-1.
Schlage die spezifische SQL-Anweisung nach, überprüfe die Syntax und lies die Abschnitte "Schlüsselwörter", "Regeln im Überblick" und "Programmiertipps und -fehler" sowie den Abschnitt über den Standard für SQL-Syntax und -Beschreibung. Tu dies auch, wenn du nach einer bestimmten Plattformimplementierung suchst.
Lies schließlich die plattformspezifischen Implementierungsinformationen.
Du wirst feststellen, dass der Eintrag für eine bestimmte Plattformimplementierung keine Informationen über Klauseln enthält, die sich nicht vom Standard unterscheiden. ...
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