September 2024
Intermediate to advanced
400 pages
10h 11m
German
Content preview from Snowflake SQL und Skripting lernen
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Kapitel 6. Datengenerierung, -umwandlung und -manipulation
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In Kapitel 5 hast du die verschiedenen in Snowflake verfügbaren Datentypen kennengelernt, darunter numerische, zeitliche und zeichenbezogene. In diesem Kapitel lernst du die vielen eingebauten Funktionen von Snowflake kennen, mit denen du Werte für diese Datentypen erzeugen, konvertieren und manipulieren kannst.
Arbeiten mit Zeichendaten
Snowflake enthält eine Vielzahl von Funktionen, die für die Verarbeitung von Zeichendaten verwendet werden, egal ob du Zeichenketten verketten, nach Teilstrings suchen, in Groß- oder Kleinbuchstaben umwandeln oder irgendetwas anderes tun musst.
String-Erzeugung und -Manipulation
Um ein String-Literal zu erstellen, musst du nur deine Zeichenfolge in einfache Anführungszeichen setzen:
PUBLIC>select 'here is my string'; +---------------------+ | 'HERE IS MY STRING' | |---------------------| | here is my string | +---------------------+
Wenn du zwei Strings hast, die du verketten möchtest, kannst du entweder den Operator || oder die integrierte Funktion concat() verwenden:
PUBLIC>select 'string 1' || ' and ' || 'string2';
+------------------------------------
| 'STRING 1' || ' AND ' || 'STRING2' |
|------------------------------------|
| string 1 and string2 |
+------------------------------------+
PUBLIC>select concat('string1',' and ','string2'); ...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,
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