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.
MSQL
In 1993–94 David Hughes developed a network monitoring and management system called Minerva The design of this system required a database management system to store its configuration and working data. To enable future portability, Hughes elected to use an Structured Query Language interface between the application and the database management system, despite the fact that at the time there was no free or inexpensive SQL database management implementation available. Hughes therefore developed a translation program which provided an interface to the free Postgres DBMS (which did not use SQL). This product was named miniSQL, or mSQL. In time it became clear that Postgres did not perform adequately on the low-specification systems used to run Minerva, so mSQL developed into a lightweight database management system in its own right, implementing a limited subset of the SQL standard, but performing well on minimally specified hardware.