June 2022
Intermediate to advanced
328 pages
5h 31m
German
Content preview from SQL – kurz & gut , 3rd EditionBecome 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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KAPITEL 4
SQL-Abfragen: Die Grundlagen
Eine SELECT-Anweisung, die üblicherweise aus sechs Klauseln besteht, bezeichnet man auch als Abfrage. Die einzelnen Klauseln werden jeweils in einem eigenen Abschnitt dieses Kapitels näher behandelt:
Der letzte Abschnitt in diesem Kapitel befasst sich mit der LIMIT – Klausel, die von MySQL, PostgreSQL und SQLite unterstützt wird.
Die Codebeispiele in diesem Kapitel beziehen sich auf vier Tabellen:
waterfall
Wasserfälle auf der Oberen Halbinsel von Michigan
owner
Besitzer der Wasserfälle
county
Counties, in denen sich die Wasserfälle befinden
tour
Touren, die an mehreren Wasserfällen haltmachen
Hier ist eine Beispielabfrage, die unsere sechs wichtigsten Klauseln ...
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