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.
MemSQL
MemSQL is a distributed, in-memory, SQL database management system.
It is a relational database management system (RDBMS). It compiles Structured Query Language (SQL) into machine code, via termed code generation.
On April 23, 2013, MemSQL launched its first generally available version of the database to the public.