June 2022
Intermediate to advanced
328 pages
5h 31m
German
Content preview from SQL – kurz & gut , 3rd Edition
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KAPITEL 6
Datentypen
In einer SQL-Tabelle darf jede Spalte nur Werte eines einzigen Datentyps enthalten. Dieses Kapitel behandelt die üblicherweise verwendeten Datentypen und erklärt Ihnen, wie und wann diese eingesetzt werden.
Die folgende Anweisung legt drei Spalten fest und gibt die Datentypen an, die in den einzelnen Spalten gelten sollen: id enthält Integer-Werte, name enthält Werte, die aus bis zu 30 Zeichen bestehen können, und dt nimmt Datumswerte auf:
CREATE TABLE my_table (
id INT,
name VARCHAR(30),
dt DATE
);
INT, VARCHAR und DATE sind nur drei der vielen Datentypen in SQL. Tabelle 6-1 listet vier Kategorien von Datentypen auf sowie gebräuchliche Unterkategorien. Es gibt unter den RDBMS große Variationen in der Syntax der Datentypen. ...
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