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.
Mimer SQL
Mimer SQL originated from a project from the ITC service center supporting Uppsala University and some other institutions to leverage the Relational database capabilities proposed by Codd and others. The initial release in about 1975 was designated "RAPID" and was written in IBM assembler language. The name was changed to "Mimer" in 1977 to avoid a trademark issue. Other universities were interested in the project on a number of machine architectures and Mimer was re-written in FORTRAN to achieve portability. Further models were developed for Mimer with the Mimer/QL implementing the QUEL query languages.