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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