From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
---|---|
To: | Hubert Palme <hubert(dot)palme(at)web(dot)de> |
Cc: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Line Numbering in SELRCT Output |
Date: | 2002-03-18 22:51:24 |
Message-ID: | 20020318144733.E11746-100000@megazone23.bigpanda.com |
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Lists: | pgsql-sql |
On Mon, 18 Mar 2002, Hubert Palme wrote:
> >>>>> "S" == Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> writes:
>
> S> On Mon, 11 Mar 2002, Hubert Palme wrote:
> >> Paul wrote:
> >>
> >> > CREATE SEQUENCE seq1;
> >> >
> >> > SELECT nextval('seq1'), amname FROM pg_am;
> >> >
> >> > DROP SEQUENCE seq1;
> >> >
> >>
> >> Hmm... I forgot to mention that my SELECT statement has an ORDER BY clause.
> >> The sort is done after the sequence numbers being generated. So the order
> >> of the sequence numbers becomes damaged by the sort.
> >>
> >> Is there any hint how to avoid this?
>
> S> select nextval('seq1'), foo.* from (select ...) foo;
>
> I tried this:
>
>CREATE SEQUENCE z_nummer;
>SELECT nextval('z_nummer'), hilfstab.name, hilfstab.vorname
>FROM (SELECT *
> FROM leute
> ORDER BY name, vorname) hilfstab;
> DROP SEQUENCE z_nummer;
>
> and got this result:
>
> mitglieder=> \i selorder.sql
> CREATE
> psql:selorder.sql:5: ERROR: parser: parse error at or near "select"
> DROP
> mitglieder=>
>
> Did I understand you right, this kind of subqueries in FROM clauses
> are allowed? (Didn't find it in any manual)
What version are you using?
AFAIK that structure is allowed in 7.1 and after.
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