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.
Ashton-Tate
Ed Esber and Bill Gates introduced SQL Server to the world in a joint New York press conference. The basic idea was to use SQL Server as a back-end and dBASE as the front-end, allowing the existing dBASE market to use their forms and programming knowledge on top of a SQL system. SQL Server was actually a product developed by Sybase corporation, which Microsoft had licensed. From a business perspective this had little direct effect on the company, at least in the short term.