The name was later changed for legal reasons. The first commercially available implementation of the language was named SEQUEL (for Sequential English QUEry Language) and was part of IBM's SEQUEL/DS product. The name SQL originally stood for Structured Query Language. The language, SQL, was originally developed in the research division of IBM (initially at Yorktown Heights, N.Y., and later at San Jose, Calif., and Raymond Boyce and Donald Chamberlin were the original designers.)3 and has been adopted by all major relational database vendors. He has since expanded on the 12 rules, and they now number 333, as published in his book " The Relational Model for Database Management, Version 2" (Addison -Wesley, 1990). His famous "Twelve Rules for Relational 2 Databases" were published in two Computerworld articles "Is Your DBMS Really Relational?" and "Does Your DBMS Run By the Rules?" on October 14, 1985, and October 21, 1985, respectively. Codd throughout the 1970s and 80s are still considered gospel for relational database implementations. Codd in technical literature) in the IBM research report RJ599, dated August 19th, However, the article that is usually considered the cornerstone of this technology is "A Relational Model of Data for Large Shared Data Banks," published in Communications of the ACM(Vol. 1 History The concept of relational databases was first described by Edgar Frank Codd (almost exclusively referenced as E.
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