SQL:2003
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SQL:2003 is the fifth revision of the SQL database query language.
Introduced XML-related features, window functions, standardized sequences and columns with auto-generated values (including identity-columns).
The SQL standard is not freely available. SQL:2003 may be purchased from ISO or ANSI. A late draft is available as a zip archive from Whitemarsh Information Systems Corporation. The zip archive contains a number of PDF files that define the parts of the SQL:2003 specification.