September 2024
Intermediate to advanced
400 pages
10h 11m
German
Content preview from Snowflake SQL und Skripting lernen
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Kapitel 15. Snowflake Scripting Language
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Wie bereits im Vorwort erwähnt, ist SQL eine nicht-prozedurale Sprache, d.h. du definierst die gewünschten Ergebnisse, aber nicht die Schritte, die zur Erzeugung der Ergebnisse erforderlich sind. Das bedeutet, dass Snowflake anhand der Informationen, die es über deine Tabellen gesammelt hat, die beste (und hoffentlich schnellste) Methode zum Abrufen der Daten ermitteln muss. Jetzt ist es an der Zeit, den Gang zu wechseln und Snowflakes prozedurale Sprache, die sogenannte Snowflake Scripting Language, zu besprechen. In diesem Kapitel werden die verschiedenen Sprachkomponenten vorgestellt und in den beiden folgenden Kapiteln wird gezeigt, wie du mit Snowflake Scripting Stored Procedures und Tabellenfunktionen erstellst.
Ein wenig Hintergrund
Wenn du mit anderen Datenbanken als Snowflake gearbeitet hast, bist du vielleicht schon mit der Verwendung einer eingebetteten (innerhalb der Datenbank ausgeführten) prozeduralen Sprache vertraut. Einige Beispiele sind PL/SQL von Oracle oder Transact-SQL von Microsoft. Wenn du mit diesen Sprachen nicht vertraut bist, kannst du dir darunter eine Sprache vorstellen, die die Möglichkeit bietet, select, delete, update, insert und merge Anweisungen auszuführen, sowie Konstrukte für die Definition von Variablen, bedingte Logik (z.B. if-then-else), Schleifen (z.B. for und while ...
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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.