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Alpha (programming language)
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/QUEL_query_languages/3uGE8f84">QUEL query languages</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Codd, E.F., "Data Base Sublanguage Founded on the Relational Calculus", Proc. 1971 ACM-SIGFIDET Workshop on Data Description, Access, and Control, San Diego. <a href="http://dl.acm.org/citation.cfm?id=1734718" target="_blank">http://dl.acm.org/citation.cfm?id=1734718</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"ALPHA was never implemented, but its ideas were influential on the design of QUEL and (to a much lesser extent) SQL", Date, C.J., The Relational Database Dictionary, 2009 <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Codd, E.F., "Relational Completeness of Data Base Sublanguages", IBM Research Laboratory, RJ987, 1972. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>