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List: postgis-users
Subject: [postgis-users] TR: add group number to a group by clause
From: Olivier_Leprêtre <o.lepretre () gmail ! com>
Date: 2017-07-21 7:07:08
Message-ID: 5971a821.3888df0a.6a4a5.5cea () mx ! google ! com
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Hi James,
Thanks it helped me (I didn't understood what you would for 'y') but I found this way \
of doing :
select case when lag(o.geom) OVER (PARTITION BY o.geom) = o.geom then '' else 'x ' || \
o.nbre::text end ,d.code,d.numero,d.nomvoie,d.commune from
(select geom,count(*) as nbre from adress group by geom having count(*) >1) as o,
lateral (select * from adress order by numero,nomvoie,commune ) as d where \
st_within(o.geom,d.geom)
in this case, each group begins with 'x times'. I do not add any value in the first \
column until next change. Not what I was thinking about at the beginning but perhaps \
easier to understand !
Olivier
De : postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] De la part de James \
Keener Envoyé : jeudi 20 juillet 2017 20:18
À : PostGIS Users Discussion
Objet : Re: [postgis-users] add group number to a group by clause
You could try something with a window function. Something like case when lag(x) = x \
then y else y + 1 end
On Thu, Jul 20, 2017 at 1:53 PM, Olivier Leprêtre <o.lepretre@gmail.com> wrote:
Hi,
I have sets of points which are piled up by groups. I found how to show the different \
groups with the query below but I didn't find how to add a group number for each \
group. I tried with "over partition" but it seems that it's not possible to partition \
with geom column.
Here is the query :
select o.nbre,d.code,d.numero,d.nomvoie,d.commune from
(select geom,count(*) as nbre from adress group by geom having count(*) >1) as o,
lateral (select * from adress) as d where st_within(o.geom,d.geom)
it returns the piled points preceded with piled points count.
3 pointa (3 piled points)
3 pointf
3 pointg
2 point1 (2 pp)
2 point2
4 pntw (4 pp)
4 pntx
4 pnty
4 pntz
How can I add a group column like this ?
1 3 pointa
1 3 pointf
1 3 pointg
2 2 point1
2 2 point2
3 4 pntw
3 4 pntx
3 4 pnty
3 4 pntz
Thanks for any idea,
Olivier
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class=WordSection1><p class=MsoNormal><span \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Hi \
James,<o:p></o:p></span></p><p class=MsoNormal><span \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Thanks it \
helped me (I didn't understood what you would for 'y') but I found this way of doing \
:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>select case \
when lag(o.geom) OVER (PARTITION BY o.geom) = o.geom then '' else 'x ' || \
o.nbre::text end ,d.code,d.numero,d.nomvoie,d.commune from<o:p></o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>(select \
geom,count(*) as nbre from adress group by geom having count(*) >1) as \
o,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'> \
lateral (select * from adress order by numero,nomvoie,commune ) as d where \
st_within(o.geom,d.geom) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>in this \
case, each group begins with 'x times'. I do not add any value in the first column \
until next change. Not what I was thinking about at the beginning but perhaps easier \
to understand !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Olivier<o:p></o:p></span></p><p \
class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div \
style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p \
class=MsoNormal><b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> postgis-users [<a \
href="mailto:postgis-users-bounces@lists.osgeo.org">mailto:postgis-users-bounces@lists.osgeo.org</a>] \
<b>De la part de</b> James Keener<br><b>Envoyé :</b> jeudi 20 juillet 2017 \
20:18<br><b>À :</b> PostGIS Users Discussion<br><b>Objet :</b> Re: \
[postgis-users] add group number to a group by clause<o:p></o:p></span></p></div><p \
class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>You could try something \
with a window function. Something like case when lag(x) = x then y else y + 1 \
end<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><p \
class=MsoNormal>On Thu, Jul 20, 2017 at 1:53 PM, Olivier Leprêtre <<a \
href="mailto:o.lepretre@gmail.com" target="_blank">o.lepretre@gmail.com</a>> \
wrote:<o:p></o:p></p><div><div><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Hi,</span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>I have sets of \
points which are piled up by groups. I found how to show the different groups with \
the query below but I didn't find how to add a group number for each group. I tried \
with "over partition" but it seems that it's not possible to partition with \
geom column.</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Here is the \
query :</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>select \
o.nbre,d.code,d.numero,d.nomvoie,d.commune from</span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>(select \
geom,count(*) as nbre from adress group by geom having count(*) >1) as \
o,</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> \
lateral (select * from adress) as d where \
st_within(o.geom,d.geom)</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>it returns the \
piled points preceded with piled points count.</span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 pointa (3 \
piled points)</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
pointf</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
pointg</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2 point1 (2 \
pp)</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2 \
point2</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>4 \
pntw (4 pp)</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>4 \
pntx</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>4 \
pnty</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>4 \
pntz</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>How can I add \
a group column like this ?</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1 \
3 pointa</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1 \
3 pointf</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1 \
3 pointg</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2 \
2 point1</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>2 \
2 point2</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
4 pntw</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
4 pntx</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
4 pnty</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>3 \
4 pntz</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Thanks for any \
idea,</span><o:p></o:p></p><p class=MsoNormal \
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Olivier</span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif"'> </span><o:p></o:p></p><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
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