Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eORaC-0003P1-6H for pgsql-sql@arkaria.postgresql.org; Mon, 11 Dec 2017 17:09:36 +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 1eORaB-0007uM-G7 for pgsql-sql@arkaria.postgresql.org; Mon, 11 Dec 2017 17:09:35 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1eORaB-0007uA-4e for pgsql-sql@lists.postgresql.org; Mon, 11 Dec 2017 17:09:35 +0000 Received: from mail-wr0-x22d.google.com ([2a00:1450:400c:c0c::22d]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1eORa7-0000kq-Jt for pgsql-sql@lists.postgresql.org; Mon, 11 Dec 2017 17:09:34 +0000 Received: by mail-wr0-x22d.google.com with SMTP id x49so18327211wrb.13 for ; Mon, 11 Dec 2017 09:09:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:from:to:subject:date:mime-version:thread-index :content-language; bh=98UB6j00qPuhPa5Y/XTFF3hREwlOK4BMXBht6WkU0UU=; b=HlztrHMSjBNk4praTJ4YLgdfJnpXjE9SUNajArXteTqdOIQQ1nkDYN/CPf7qRiJBO4 Tjapcp9GFj/IeYEYghggqtKjouCo7MQtd87m13HHxuvvksYq/NWD0cME6vi0HQTK6IKt j4Lr0t7gNMif4kk5vkGwjMPspYU5iOdSZtFy4QED+O+PLAxY+v6S5RoWg8EfAs7oU3+m iVTDMAXdjY5oZnCxVJklfXkUu5473yqHrZeB25oqxyjE+NJ2BaddVH5P+5egSk4yuwD0 NBe+UemPgaMXnFY7eBxiiJKUi/DBDxQx5FPTu4Mhkus2H8jcbowpbXYoM90M39HTDREy 75sA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:from:to:subject:date:mime-version :thread-index:content-language; bh=98UB6j00qPuhPa5Y/XTFF3hREwlOK4BMXBht6WkU0UU=; b=oMQgkWnToH2JToDCZYcDWGrRPXPYWqWpZJN7UeKnauFB14gfwrHS61rUmz+NKcpVs4 nIoDjbCtwa2lPiyEZ3mBoH+EN/8i/qsx6o+PCeFTiurcTKX726AtUDvrsYOnYMDpQX3r 8SCtnRXoMeI7N1NWBXImH06+ZsFEGLi1t8zZVUpxOWRAwP6cp1it/O/sIwZMkjqzwkWA E3B2SRFhgDoMBB7EwyvDlYPkrM6Gn1HuXCUr2YcQ0DFj6QdPGhSUsHCIEWV0wTB7UeNo J2p1Ps+EgDS16fEXlJGcpXx6l4ZI86JZB04iguj8HJixZGN0/FTV0z3sQ0tVGtpvR7HJ rzgQ== X-Gm-Message-State: AKGB3mLSqepnpf4bY58icNC5LPO9e4UARETy/19kF5nWFECs3G3bDjVr 9NEZTHvuvnHNo1S8VPQETs3PaQ== X-Google-Smtp-Source: ACJfBotZq6s8ODEMKvDfZao6YPET+5b9iPtxpK/UA5+8OLPk+ZWLku+v5OTHJKzG78f6arn4ziG7qw== X-Received: by 10.223.152.234 with SMTP id w97mr1001508wrb.215.1513012169952; Mon, 11 Dec 2017 09:09:29 -0800 (PST) Received: from PADOUE (mau78-1-88-184-109-217.fbx.proxad.net. [88.184.109.217]) by smtp.gmail.com with ESMTPSA id f132sm9224313wmf.17.2017.12.11.09.09.28 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 11 Dec 2017 09:09:29 -0800 (PST) Message-ID: <5a2ebbc9.8a1f1c0a.ea0ea.7b4a@mx.google.com> X-Google-Original-Message-ID: <00b201d372a2$ccd2c5b0$66785110$@lepretre@gmail.com> From: =?iso-8859-1?Q?Olivier_Lepr=EAtre?= To: Subject: Windowing ? Date: Mon, 11 Dec 2017 18:09:25 +0100 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B3_01D372AB.2E972DB0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdNyostAt/q/WHNBSXmiOS04/3e3ww== Content-Language: fr X-Antivirus: Avast (VPS 171210-2, 10/12/2017), Outbound message X-Antivirus-Status: Clean List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is a multi-part message in MIME format. ------=_NextPart_000_00B3_01D372AB.2E972DB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I have a table describing sort of ordered road segments and their associate= d weight. I would like to calculate weight deltas between two consecutive segments. Problem is to substract previous from current row and reuses result as input for the next row. I tried some windowing tests but was unsuccessful. Input table : road segment weight 1 1 80 1 2 5 1 3 3 2 1 75 2 2 8 2 3 12 2 4 3 The result should be a new delta column : road segment weight delta 1 1 80 80 (80-0) first row 1 2 5 75 (80-5) 1 3 3 72 (75-3) 2 1 75 75 (75-0) 2 2 8 67 (75-8) 2 3 12 55 (67-12) 2 4 3 52 (55-3) Thanks for any help, By the way, thanks again to Andreas and Martin that unstucked my mind yesterday as I was searching for complicated solutions when a very simple one existed. Have a good day (or good evening) Olivier --- L'absence de virus dans ce courrier =E9lectronique a =E9t=E9 v=E9rifi=E9e p= ar le logiciel antivirus Avast. https://www.avast.com/antivirus ------=_NextPart_000_00B3_01D372AB.2E972DB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

=

 

I ha= ve a table describing sort of ordered road segments and their associated we= ight. I would like to calculate weight deltas between two consecutive segme= nts. Problem is to substract previous from current row and reuses result as= input for the next row. I tried some windowing tests but was unsuccessful.=

 

Input table :

 

road= =A0=A0 segment=A0=A0=A0=A0=A0=A0 weight

1=A0=A0=A0=A0=A0=A0=A0 1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 80

1=A0=A0=A0= =A0=A0=A0=A0 2=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5=

1=A0=A0=A0=A0=A0=A0=A0 3=A0=A0=A0=A0= =A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0=A0 3

2=A0=A0=A0=A0=A0=A0=A0 1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0 75

2=A0=A0=A0=A0= =A0=A0=A0 2=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 8

2=A0=A0=A0=A0=A0=A0=A0 3=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 12

2=A0=A0=A0=A0=A0=A0=A0 4=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0 3

 

The result should be a new delta co= lumn :

 <= /span>

road=A0=A0 segment=A0=A0=A0=A0=A0=A0 w= eight delta

1=A0=A0=A0=A0= =A0=A0=A0 1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 80=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 80=A0=A0=A0=A0=A0 (80-0) first row

1=A0=A0=A0=A0=A0=A0=A0 2=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0 75=A0=A0=A0=A0=A0 (80-5)

1=A0=A0=A0=A0=A0=A0=A0 3=A0=A0=A0=A0=A0=A0=A0 =A0=A0=A0=A0=A0= =A0=A0=A0 3=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 72=A0=A0=A0=A0= =A0 (75-3)

 

2=A0=A0=A0=A0=A0=A0=A0 1=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 75=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0 75=A0=A0=A0=A0=A0 (75-0)

2=A0=A0=A0=A0=A0=A0=A0 2=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 8=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 67=A0=A0=A0=A0=A0 = (75-8)

2=A0=A0=A0=A0=A0= =A0=A0 3=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 12=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 55=A0=A0=A0=A0=A0 (67-12)<= /p>

2=A0=A0=A0=A0=A0=A0=A0 4=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0 3=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0 52=A0=A0=A0=A0=A0 (55-3)

 

Thanks for any hel= p,

 =

By the way, thanks again to Andreas and Mart= in that unstucked my mind yesterday as I was searching for complicated solu= tions when a very simple one existed.

 

Have a go= od day (or good evening)

 

Olivier


3D"" Garant= i sans virus. www.avast.com
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