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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Was nicht in eine Datenbank gehört – Einschränkungen definieren
Mit den erlernten Befehlen CREATE TABLE und INSERT INTO ist es relativ einfach, eine Relation nach eigenen Vorstellungen zu erstellen und anschließend mit passenden Daten zu befüllen. Aber was sind eigentlich passende Daten?
Abhängig von der betrachteten Relation und dem Attribut kann dies variieren. Ein geeigneter Wert für eine Kursbewertung liegt beispielsweise irgendwo zwischen 1 und 5. Ein Geburtsdatum darf nicht in der Zukunft liegen und je nach Kursinhalt muss möglicherweise erst ein bestimmtes Mindestalter erreicht werden.
Mit Datentypen haben Sie bereits eine Möglichkeit kennengelernt, ...
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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.