From: Axel Rau <Axel.Rau@Chaos1.DE>
To: Richard Huxton <dev@archonet.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Selecting count of details along with details columns
Date: Thu, 29 Sep 2005 11:19:39 +0200
Message-ID: <a79cd5e3132c2d4c3430a34e64d93ebe@Chaos1.DE> (raw)
In-Reply-To: <433BA637.7040106@archonet.com>
References: <8365994213849c93946e61ded7d12318@Chaos1.DE>
<433BA637.7040106@archonet.com>
Am 29.09.2005 um 10:30 schrieb Richard Huxton:
> Axel Rau wrote:
>> SELECT T2.T2_name, COUNT(T1.id) AS xx
>> FROM T2, T1
>> WHERE T2.id = T1.fk_t2
>> GROUP BY T2.T2_name
>> HAVING COUNT(T1.id) > 1
>> ORDER BY xx DESC;
>> t2_name | xx
>> ---------+----
>> T2-N2 | 3
>> T2-N3 | 2
>> (2 rows)
>> Adding column t1_name to the result set breaks COUNT(T1.id):
>> SELECT T2.T2_name, T1.T1_name, COUNT(T1.id) AS xx
>> FROM T2, T1
>> WHERE T2.id = T1.fk_t2
>> GROUP BY T2.T2_name, T1.T1_name
>> HAVING COUNT(T1.id) > 1
>> ORDER BY xx DESC;
>> t2_name | t1_name | xx
>> ---------+---------+----
>> (0 rows)
>> How can I do this with pg ?
>
> Do what? You don't say what results you are expecting.
>
> Do you want:
> 1. ALL values of T1_name (in which case what count do you want)?
> 2. The FIRST value of T1_name (in which case what do you mean by
> first)?
#1.:
t2_name | t1_name | count
---------+---------+-------
T2-N2 | T1-CCC | 3
T2-N3 | T1-FFF | 2
T2-N2 | T1-BBB | 3
T2-N2 | T1-DDD | 3
T2-N3 | T1-EEE | 2
(5 rows)
Sorry, for not making this clear.
Thank you for taking the time,
Axel
Axel Rau, Frankfurt, Germany +49-69-951418-0
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To: pgsql-sql@postgresql.org
Cc: Axel.Rau@Chaos1.DE, dev@archonet.com
Subject: Re: Selecting count of details along with details columns
In-Reply-To: <a79cd5e3132c2d4c3430a34e64d93ebe@Chaos1.DE>
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