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.
SQL Server Notification Services
SQL Server Notification Services was one of the many components that comprised Microsoft SQL Server. It was first released in Microsoft SQL Server 2000 Service Pack 2 (2003). An enhanced release shipped in SQL Server 2005.
It was discontinued and removed from SQL Server 2008, although SQL Server 2005 SP3 allows for the Notification Services components to be run against the SQL Server 2008 Database Engine.
It has been replaced by StreamInsight which first shipped as a component of SQL 2008 R2. StreamInsight is a separate install and not visible as a part of a regular SQL Server setup.