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Surhone, L. M., Tennoe, M. T., & Henssonow, S. F. (2010), SQL:1999: Query languages, ATS (programming language), ABSET, Betascript PublishingCS1 maint: Multiple names: authors list (link)
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Yes. The article currently contains many languages that are not related to SQL or relational databases -- for example, XPath, SPARQL, MDX, LDAP. Also, there is a subtle difference between query languages and tools "producing SQL" -- e.g., DSLs or frameworks.