Message-ID: <433BA637.7040106@archonet.com>
Date: Thu, 29 Sep 2005 09:30:47 +0100
From: Richard Huxton <dev@archonet.com>
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To: Axel Rau <Axel.Rau@Chaos1.DE>
Cc: pgsql-sql@postgresql.org
Subject: Re: Selecting count of details along with details columns
References: <8365994213849c93946e61ded7d12318@Chaos1.DE>
In-Reply-To: <8365994213849c93946e61ded7d12318@Chaos1.DE>
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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)?

-- 
   Richard Huxton
   Archonet Ltd