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List: postgis-users
Subject: Re: [postgis-users] avoid duplicates with lateral auto join
From: Olivier_Leprêtre <o.lepretre () gmail ! com>
Date: 2017-05-28 15:21:04
Message-ID: 592aeae2.56691c0a.9218d.0665 () mx ! google ! com
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Very smart Darafei, thanks !
I was not aware of the ctid column
De : postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] De la part de \
Darafei "Kom?pa" Praliaskouski Envoyé : dimanche 28 mai 2017 16:30
À : PostGIS Users Discussion
Objet : Re: [postgis-users] avoid duplicates with lateral auto join
Add something like
where o.ctid < t1.ctid
to the inner query.
Also, the query doesn't need to be lateral join,
select
a.name,
b.name
from t1 a, t1 b
where ST_Intersects(a.geom, b.geom)
and a.ctid < b.ctid;
should work the same.
вс, 28 мая 2017 г. в 15:18, Olivier Leprêtre <o.lepretre@gmail.com>:
Hi,
Doing a lateral auto join return cross results like A,B and B,A. Is there a simple \
trick to avoid that ?
To explain : in such query
select o.name,nam1 from
t1 o,
lateral (select o.name,t1.nam nam1 from t1
where st_overlaps(o.geom,t1.geom)) lat
order by o.name
I get results like
polygon1 polygon2
polygon2 polygon1
because polygon1 overlap polygon2 and conversely.
how could I get only one of those pairs ?
Thanks,
Olivier
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class=WordSection1><p class=MsoNormal><span lang=EN-US \
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D'>Very smart \
Darafei, thanks !<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'>I was not \
aware of the ctid column<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 \
[mailto:postgis-users-bounces@lists.osgeo.org] <b>De la part de</b> Darafei \
"Kom?pa" Praliaskouski<br><b>Envoyé :</b> dimanche 28 mai 2017 \
16:30<br><b>À :</b> PostGIS Users Discussion<br><b>Objet :</b> Re: \
[postgis-users] avoid duplicates with lateral auto join<o:p></o:p></span></p></div><p \
class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Add something \
like <br><br>where o.ctid < t1.ctid <br><br>to the inner query.<br>Also, \
the query doesn't need to be lateral join,<br><br>select <br><a \
href="http://a.name">a.name</a>,<br><a href="http://b.name">b.name</a><br>from t1 a, \
t1 b<br>where ST_Intersects(a.geom, b.geom) <br>and a.ctid < \
b.ctid;<br><br>should work the same.<o:p></o:p></p></div><p \
class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>вс, 28 мая \
2017 г. в 15:18, Olivier Leprêtre <<a \
href="mailto:o.lepretre@gmail.com">o.lepretre@gmail.com</a>>:<o:p></o:p></p></div><blockquote \
style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm \
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'><div><div><p \
class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span \
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 \
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"'>Doing a \
lateral auto join return cross results like A,B and B,A. Is there a simple trick to \
avoid that ?</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"'>To explain : \
in such 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 <a \
href="http://o.name" target="_blank">o.name</a>,nam1 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"'>t1 \
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 <a \
href="http://o.name" target="_blank">o.name</a>,t1.nam nam1 from \
t1</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"'>where \
st_overlaps(o.geom,t1.geom)) lat</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"'>order by <a \
href="http://o.name" target="_blank">o.name</a></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 get results \
like</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"'>polygon1 \
polygon2</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"'>polygon2 \
polygon1</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"'>because \
polygon1 overlap polygon2 and conversely.</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 could I \
get only one of those pairs ?</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,</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> </span><o:p></o:p></p></div><div \
id="m_7124570515368415938DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><p \
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