The ANSI standards refer to the ISO standards. If you need the ISO SQL specs, I would suggest purchasing them from ISO.org. Both ANSI and ISO sell copies of their standards as one method of covering the cost of creating and revising the standards.(http://www.iso.org/iso/en/StandardsQueryFormHandler.StandardsQueryFormHandler?scope=CATALOGUE&sortOrder=ISO&committee=ALL&isoDocType=ALL&title=true&keyword=sql)

Corrigendum are frequently publish and are usually available for free at http://www.ansi.org. Search on SQL.

The links in the previous forum are incorrect. One link is to a presentation "Great News, The Relational Data Model is Dead!" via a software company, the other link is to a text file of the "Second Informal Review Draft" of the 1992 standard.