From: Dan Langille <dan@langille.org>
To: Chad Thompson <chad@weblinkservices.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: 7.3 "group by" issue
Date: Fri, 21 Feb 2003 15:45:45 -0500
Message-ID: <3E5649A9.26494.1F008FD6@localhost> (raw)
In-Reply-To: <050201c2d9e8$23acc340$32021aac@chad>
On 21 Feb 2003 at 13:30, Chad Thompson wrote:
> The same applies to group by... Sorry for the confusion.
>
> If the column is not in the select section of the statement, it cant group
> by it.
> Try this.
>
> 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 wle_element_id
Yes, that works. But so do these.
SELECT watch_list_element.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
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 element_id
The original situation which did not work is:
SELECT watch_list_element.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 element_id
My question: why should it not work? It's referring to the same
column as the previous two examples which do work.
--
Dan Langille : http://www.langille.org/
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To: pgsql-sql@postgresql.org
Cc: dan@langille.org, chad@weblinkservices.com
Subject: Re: 7.3 "group by" issue
In-Reply-To: <3E5649A9.26494.1F008FD6@localhost>
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