Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ef7QW-0005GZ-NV for pgsql-sql@arkaria.postgresql.org; Fri, 26 Jan 2018 17:04:33 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ef7QW-0007pA-9M for pgsql-sql@arkaria.postgresql.org; Fri, 26 Jan 2018 17:04:32 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1ef7QV-0007p1-PV for pgsql-sql@lists.postgresql.org; Fri, 26 Jan 2018 17:04:32 +0000 Received: from mail.inqbus.de ([164.177.165.236]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1ef7QR-0004cr-T8 for pgsql-sql@lists.postgresql.org; Fri, 26 Jan 2018 17:04:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=stb-datenservice.de; s=20160215; h=Content-Type:In-Reply-To:MIME-Version: Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=LpD94oVMRFeUT+6v19FB8hZ5/5bGe6GLPk9y5gV5M1o=; b=Yd5SlTBY6QqkyVDhAJ3n56Cip 31yMwm6Yql8kt+B+OVpl/U0MBiLFObZcD4mo2wxpOl6nczP5EyLrFGLumY1klsAFCj8krgy/Vq02w iI/7Q3xH3nNiH+E9uxnr7tb1NV2fEHFvJO5ztHvl78KCm06jX4ojmirpJFuBboGgtcZvE=; Received: from x5ce5464c.dyn.telefonica.de ([92.229.70.76]:60792 helo=[192.168.178.20]) by mail.inqbus.de with esmtpa (Exim 4.88) (envelope-from ) id 1ef7QJ-0004jc-EH; Fri, 26 Jan 2018 18:04:21 +0100 Subject: Re: nth_value and row_number in a partition To: =?UTF-8?Q?Olivier_Lepr=c3=aatre?= , pgsql-sql@lists.postgresql.org, "'David G. Johnston'" References: <015201d3960a$a2db0b60$e8912220$@gmail.com> <016401d39615$9b620bd0$d2262370$@gmail.com> <004e01d396c6$907e6590$b17b30b0$@maule.fr> From: =?UTF-8?Q?Martin_St=c3=b6cker?= Message-ID: Date: Fri, 26 Jan 2018 18:04:18 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: <004e01d396c6$907e6590$b17b30b0$@maule.fr> Content-Type: multipart/alternative; boundary="------------38D89FD87E8847B60D006417" Content-Language: de List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is a multi-part message in MIME format. --------------38D89FD87E8847B60D006417 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit same to you it's always a pleasure to help Am 26.01.2018 um 17:56 schrieb Olivier Leprêtre: > > David, Martin, thanks for your kind help everything works now ! > > Nice week-end to all of you > > Olivier > > *De :*Martin Stöcker [mailto:martin.stoecker@stb-datenservice.de] > *Envoyé :* jeudi 25 janvier 2018 21:13 > *À :* Olivier Leprêtre ; > pgsql-sql@lists.postgresql.org > *Objet :* Re: nth_value and row_number in a partition > > Hi Olivier > > can you please give me the structure of your table, maybee some sample > data too. > And please describe in words not in SQL your calculation. > > Regards Martin > > Am 25.01.2018 um 20:49 schrieb Olivier Leprêtre: > > Hi David, > > Thanks for your answer, I tried your suggestion as well as many > other combinations, no success. Here are some of them. I just > don't understand which syntax is required > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-(nth_value(v2,cast(row_number() over (partition by > roads,*order *by orders)  as integer)) over (partition by > roads,segment order by orders))) as result > > from mytable > > or > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-(nth_value(v2,row_number() over (partition by > roads,*order* by orders)::integer)) over (partition by > roads,segment order by orders))) as result > > from mytable > > >>syntax error near order (bold) > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-(nth_value(v2,row_number() over (partition by > roads)::integer)) *over* (partition by roads,segment order by > orders))) as result > > from mytable > > >> syntax error near over > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-nth_value(v2,row_number() over (partition by > roads)::integer) over (partition by roads,segment order by > orders)) as result > > from mytable > > >> window call cannot be imbricated > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-nth_value(v2,row_number()  over (partition by > roads,segment order by orders)::integer)) as result > > from mytable > > >> nth_value requires an over clause > > select roads,orders,(first_value(v1) > > over (partition by roads,segment order by > orders)-nth_value(v2,row_number()::integer) over (partition by > roads,segment order by orders)) as result > > from mytable > > >> row_number requires an over clause > > *De :* David G. Johnston [mailto:david.g.johnston@gmail.com] > *Envoyé :* jeudi 25 janvier 2018 19:44 > *À :* Olivier Leprêtre > > *Cc :* pgsql-sql@lists.postgresql.org > > *Objet :* Re: nth_value and row_number in a partition > > On Thursday, January 25, 2018, Olivier Leprêtre > > wrote: > > nth_value(integer, bigint) doesn't exists. > > This is close, you just need to cast to integer. > > (cast(row_number() as integer)  over (partition by > roads,segments order by orders))) > > You cannot separate the window function from its over clause. > > Cast( Row_number() over (...) as integer ) > > Not tested...and I tend to use :: instead of cast > > David J. > --------------38D89FD87E8847B60D006417 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit same to you
it's always a pleasure to help

Am 26.01.2018 um 17:56 schrieb Olivier Leprêtre:

David, Martin, thanks for your kind help everything works now !

 

Nice week-end to all of you

 

Olivier

 

De : Martin Stöcker [mailto:martin.stoecker@stb-datenservice.de]
Envoyé : jeudi 25 janvier 2018 21:13
À : Olivier Leprêtre <o.lepretre@gmail.com>; pgsql-sql@lists.postgresql.org
Objet : Re: nth_value and row_number in a partition

 

Hi Olivier

can you please give me the structure of your table, maybee some sample data too.
And please describe in words not in SQL your calculation.

Regards Martin

Am 25.01.2018 um 20:49 schrieb Olivier Leprêtre:

Hi David,

 

Thanks for your answer, I tried your suggestion as well as many other combinations, no success. Here are some of them. I just don't understand which syntax is required

 

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-(nth_value(v2,cast(row_number() over (partition by roads,order by orders)  as integer)) over (partition by roads,segment order by orders))) as result

from mytable

or

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-(nth_value(v2,row_number() over (partition by roads,order by orders)::integer)) over (partition by roads,segment order by orders))) as result

from mytable

 

>>syntax error near order (bold)

 

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-(nth_value(v2,row_number() over (partition by roads)::integer)) over (partition by roads,segment order by orders))) as result

from mytable

 

>> syntax error near over

 

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-nth_value(v2,row_number() over (partition by roads)::integer) over (partition by roads,segment order by orders)) as result

from mytable

 

>> window call cannot be imbricated

 

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-nth_value(v2,row_number()  over (partition by roads,segment order by orders)::integer)) as result

from mytable

 

>> nth_value requires an over clause

 

select roads,orders,(first_value(v1)

over (partition by roads,segment order by orders)-nth_value(v2,row_number()::integer) over (partition by roads,segment order by orders)) as result

from mytable

 

>> row_number requires an over clause

 

 

 

 

 

De : David G. Johnston [mailto:david.g.johnston@gmail.com]
Envoyé : jeudi 25 janvier 2018 19:44
À : Olivier Leprêtre <o.lepretre@gmail.com>
Cc : pgsql-sql@lists.postgresql.org
Objet : Re: nth_value and row_number in a partition

 

On Thursday, January 25, 2018, Olivier Leprêtre <o.lepretre@gmail.com> wrote:

nth_value(integer, bigint) doesn't exists.  

This is close, you just need to cast to integer. 

(cast(row_number() as integer)  over (partition by roads,segments order by orders))) 

You cannot separate the window function from its over clause.

 

Cast( Row_number() over (...) as integer )

 

Not tested...and I tend to use :: instead of cast

 

David J.

 


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