SQL
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Ted Codd in the early 1970s. This version, initially called "SEQUEL" ("Structured English Query Language"), was designed to manipulate and retrieve data stored in IBM's original quasi-relational database management system, System R, which a group at IBM San Jose Research Laboratory had developed during the 1970s.
IBM Business System 12
BS12's lasting contribution to history was the use of a new query language based on ISBL, created at IBM's UK "Scientific Centre". Developers of the famous System R underway in the US at the same time were also consulted on certain matters concerning the engine, but the BS12 team rejected SQL unequivocally, being convinced that this apparently unsound and difficult-to-use language (which at that time was also relationally incomplete) would never catch on.