September 2024
Intermediate to advanced
840 pages
23h 27m
German
Content preview from SQL in a Nutshell, 4. Auflage
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Kapitel 1. Geschichte und Implementierungen von SQL
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In den frühen 1970er Jahren führte die bahnbrechende Arbeit des IBM-Forschungsmitarbeiters Dr. E. F. Codd zur Entwicklung eines relationalen Datenmodells namens SEQUEL ( Structured English Query Language). Aus SEQUEL wurde schließlich SQL, die Structured Query Language. Ironischerweise behandelt der SQL-Standard "SQL" als den Namen dieser Sprache und nicht als Akronym. Jim Melton, langjähriger Redakteur des SQL-Standards, behauptet, dass SQL ein Akronym ist und für "SQL Query Language" steht.
IBM wollte zusammen mit anderen Anbietern relationaler Datenbanken eine standardisierte Methode für den Zugriff auf und die Bearbeitung von Daten in einer relationalen Datenbank. Obwohl IBM als erstes Unternehmen die Theorie der relationalen Datenbanken entwickelte, war Oracle das erste Unternehmen, das diese Technologie auf den Markt brachte. Im Laufe der Zeit erwies sich SQL auf dem Markt als so populär, dass das American National Standards Institute (ANSI) in Zusammenarbeit mit der International Standards Organization (ISO) darauf aufmerksam wurde und in den Jahren 1986, 1989, 1992, 1999, 2003, 2008, 2011, 2016 und 2019 Standards für SQL veröffentlichte.
Seit 1986 haben verschiedene konkurrierende Sprachen es Entwicklern ermöglicht, auf relationale Daten zuzugreifen und diese zu bearbeiten. Doch nur wenige ...
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