Обсуждение: Sql

For history, see the first chapter of my book.  Also see appendix on
non-standard feature.

http://www.postgresql.org/docs/awbook.html
> Hi,
> 
> I'd like an information about the history of SQL. 
> The similarities and differences between SQL1 and SQL2 and SQL3.
> 
> Could you help me?
> 
> Thanks for your attention.
> 
> Marcia Cunha
> Belo Horizonte , Brasil.
> 

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