Structured Query Language (SQL) is a programming language for managing information stored in a relational database management system (RDBMS).
Donald Chamberlin and Raymond Boyce invented SQL at International Business Machines (IBM) in the early 1970s.
American National Standards Institute (ANSI) released the first formal SQL specification, ANSI X3.135-1986, or SQL-86, in 1986.’
Oracle released Procedural Language SQL (PL/SQL) with Oracle Database version 6.0 in 1988.
Federal Information Processing Standards (FIPS) released SQL-89 as FIPS 127-1 in 1989.
Federal Information Processing Standards (FIPS) released SQL-89 as FIPS 127-2 in 1992.
Microsoft released Transact SQL (T-SQL) with Microsoft SQL Server version 6.0 in 1995.
International Organization for Standardization (ISO) published the nine parts of the SQL-2016 standard, as ISO/IEC 9075, on December 14, 2016.
Here are various SQL implementations.