FYI, we decided we didn't want this additional capability.
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Florian G. Pflug wrote:
> Kevin Grittner wrote:
> >>>> On Thu, Aug 23, 2007 at 3:01 PM, in message <11856.1187899268@sss.pgh.pa.us>,
> > Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> The only argument I've
> >> heard that carries much weight with me is that it eases porting from
> >> other DBMS's that allow this. Are there any others besides Oracle?
> >
> >> select * from (select f1 from t)
> >
> > In Sybase:
> >
> > com.sybase.jdbc2.jdbc.SybSQLException: The derived table expression is missing a correlation name. Check derived
tablesyntax in the Reference Manual.
> > Error code: 11753
> > SQL state: ZZZZZ
>
> The really funny thing is that pgsql, mysql and at least sybase
> *explicitly* dissallow the no-alias case. Which shows that
> .) This seems to be common source of confusion and errors.
> .) Aliasless-Subqueries wouldn't lead to ambigous grammras in those databases.
> Otherwise, you'd expect to get some more generic syntax error, and not
> the very explicit "No alias, but expected one".
>
> I agree with Tom - knowing *why* the standard committee disallows that syntax -
> and why everybody except oracle chose to agree with it would be quite interesting.
>
> greetings, Florian Pflug
>
>
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