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.
SESAM (database)
SESAM / SQL Server is a relational database system originally developed by Siemens, whose role as developer was successively succeeded by Siemens Nixdorf Informationssysteme (SNI), Fujitsu Siemens Computers, and now Fujitsu Technology Solutions. It runs on the BS2000/OSD mainframe.