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
Sales of dBASE had plummeted. The company had about 63% of the overall database market in 1988, and only 43% in 1989. In the final four quarters as a company, Ashton-Tate lost close to $40 million. In August 1989, the company laid off over 400 of its 1,800 employees. The Microsoft partnership for a version called the Ashton-Tate/Microsoft SQL Server also came to nothing, as Ashton-Tate's sales channels were not prepared to sell what was then a high-end database. The first version of SQL Server also only ran on IBM OS/2, which also limited its success. A version of dBASE that communicated directly with SQL Server, called dBASE IV Server Edition, was released in 1990, and was reviewed as the best available client for SQL Server (in both Databased Advisor and DBMS magazines), but the product never gained traction and was one of the casualties of the Borland acquisition. Microsoft eventually released Access in this role instead.