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
There are several reasons for this lack of portability between database systems:SQL was adopted as a standard by the American National Standards Institute (ANSI) in 1986 as SQL-86 and the International Organization for Standardization (ISO) in 1987. It is maintained by "ISO/IEC JTC 1, Information technology, Subcommittee SC 32, Data management and interchange". The standard is commonly denoted by the pattern: "ISO/IEC 9075-n:yyyy Part n: title", or, as a shortcut, "ISO/IEC 9075".