From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org> |
Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Josh Berkus <josh(at)agliodbs(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: SQL feature requests |
Date: | 2008-03-12 17:19:29 |
Message-ID: | 200803121719.m2CHJTb10229@momjian.us |
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Thread: | |
Lists: | pgsql-hackers |
FYI, we decided we didn't want this additional capability.
---------------------------------------------------------------------------
Florian G. Pflug wrote:
> Kevin Grittner wrote:
> >>>> On Thu, Aug 23, 2007 at 3:01 PM, in message <11856(dot)1187899268(at)sss(dot)pgh(dot)pa(dot)us>,
> > Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)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 table syntax 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
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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