May 2011
Intermediate to advanced
470 pages
11h 28m
German
Content preview from SQL für Dummies, 5., aktualisierte Auflage
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Teil III
Daten speichern und abrufen
In diesem Teil…
SQL stellt einen reichhaltigen Satz von Werkzeugen zur Bearbeitung der Daten in einer relationalen Datenbank zur Verfügung. Sie können mit SQL neue Daten hinzufügen, vorhandene Daten ändern und abrufen sowie veraltete Daten löschen. Diese Fähigkeiten sind nichts Außergewöhnliches (ein menschliches Gehirn benutzt sie die ganze Zeit). Herausragend ist jedoch die Fähigkeit von SQL, in der gesamten Datenmenge genau die Daten zu lokalisieren und bereitzustellen, die Sie für Ihre Arbeit benötigen. Diese extrem wichtige Funktionalität wird erst durch SQLs umfangreiche Datenbearbeitungssprache DML (Data Manipulation Language) möglich.
In diesem Teil gehe ich auf die Einzelheiten der DML ein. Sie erfahren, wie Sie mit den SQL-Werkzeugen rohe Daten in eine zweckgerechte Form bringen und abrufen können.
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