ISO/IEC 9075

ISO/IEC 9075 "Information technology - Database languages - SQL" is an international standard for Structured Query Language, and is considered as specifying the minimum for what a database engine should fulfill in terms of SQL syntax, which is called Core SQL. The standard also defines a number of optional features.

History
The first edition was based on ANSI SQL.

Editions
New editions of the ISO standard are published regularly.

Chronological overview of the editions (which have the year of publication in their name):


 * SQL-86, ANSI X3.135:1986
 * SQL-87, ISO 9075:1987, based on the ANSI standard
 * SQL-89, ISO/IEC 9075:1989
 * SQL-92, ISO/IEC 9075:1992 - 3rd edition
 * SQL:1999, ISO/IEC 9075:1999 - 4th edition
 * SQL:2003, ISO/IEC 9075:2003 - 5th edition
 * SQL:2006, ISO/IEC 9075:2006 - (part 14 revision)
 * SQL:2008, ISO/IEC 9075:2008 - 6th edition
 * SQL:2011, ISO/IEC 9075:2011 - 7th edition
 * SQL:2016, ISO/IEC 9075:2016 - 8th edition
 * SQL:2023, ISO/IEC 9075:2023 - 9th edition