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.
History of Microsoft SQL Server
The first SQL Server 2008 R2 service pack (10.50.2500, Service Pack 1) was released on July 11, 2011. The second SQL Server 2008 R2 service pack (10.50.4000, Service Pack 2) was released on July 26, 2012. The final SQL Server 2008 R2 service pack (10.50.6000, Service Pack 3) was released on September 26, 2014.