The history of SQL language development

SQL is abbreviated as a Structured Query language (Structure query Language), a database application language that uses relational models, developed by IBM in the 70, as the prototype relational language of IBM relational database prototype system R. The information retrieval in the relational database is realized.

In the early 80, the U.S. National Bureau of Standards (ANSI) began to set up the SQL standard, the earliest ANSI standard was completed in 1986, it is also called SQL-86.
The introduction of standards has strengthened the status of SQL as a standard relational database language.
The SQL standard has been modified and perfected, the current new SQL Standard is 1992 SQL-92, it is named "International Standard ISO/IEC 9075:1992,database Language SQS".

It is because of the standardization of SQL language that most relational database systems support the SQL language, and it has developed into a low-level conversational language for various platforms to interoperate.