From: "Dan Langille" <dan@langille.org>
To: "Chad Thompson" <chad@weblinkservices.com>
Date: Fri, 21 Feb 2003 15:22:46 -0500
MIME-Version: 1.0
Subject: Re: 7.3 "group by" issue
Cc: <pgsql-sql@postgresql.org>
Message-ID: <3E564446.13428.1EEB8204@localhost>
In-reply-to: <04f401c2d9e3$f24c1070$32021aac@chad>
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On 21 Feb 2003 at 13:00, Chad Thompson wrote:


> > On 21 Feb 2003 at 19:18, Gaetano Mendola wrote:
> >
> > > > Hi folks,
> > > >
> > > > This query:
> > > >
> > > > SELECT element_id as wle_element_id, COUNT(watch_list_id)
> > > >     FROM watch_list JOIN watch_list_element
> > > >         ON watch_list.id      = watch_list_element.watch_list_id
> > > >        AND watch_list.user_id = 1
> > > >   GROUP BY watch_list_element.element_id
> > >
> > > Try:
> > >
> > > SELECT element_id as wle_element_id, COUNT(watch_list_id)
> > >      FROM watch_list JOIN watch_list_element
> > >          ON watch_list.id      = watch_list_element.watch_list_id
> > > WHERE
> > >     watch_list.user_id = 1
> > >    GROUP BY watch_list_element.element_id
> >
> > ERROR:  Attribute unnamed_join.element_id must be GROUPed or used in
> > an aggregate function
> >
> 
> I think that the wrong problem was solved here.  Items in the order by
> clause must be in the target list.
> 
> heres what it says in the docs
> *The ORDER BY clause specifies the sort order:
> 
> *SELECT select_list
> *     FROM table_expression
> *     ORDER BY column1 [ASC | DESC] [, column2 [ASC | DESC] ...]
> *column1, etc., refer to select list columns. These can be either the output
> name of a column (see Section 4.3.2) or the number of a column. Some
> examples:
> 
> Note that "column1, etc., refer to select list"

I don't see how ORDER BY enters into this situation.  It's not used.  
What are you saying?
-- 
Dan Langille : http://www.langille.org/