A language designed specifically to retrieve and manipulate data held in a database, matching ACM Computing Classification System's own Query languages node, though that node sits under Information systems rather than under General programming languages, a different top-level branch from the other categories in this tree. Belongs here: SQL, the atlas's sole query-language entity. Does not belong here: a general-purpose language that happens to be used for data access.
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1. Wikipedia: SQL
WikipediaSQL, History sectionQuote, SQL, History section
The model was described in his influential 1970 paper, "A Relational Model of Data for Large Shared Data Banks".
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