<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.E-postmall17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="SV" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks Martin!<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Från:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> postgis-users [mailto:postgis-users-bounces@lists.osgeo.org]
<b>För </b>Martin Davis<br>
<b>Skickat:</b> den 9 mars 2020 18:39<br>
<b>Till:</b> PostGIS Users Discussion<br>
<b>Ämne:</b> Re: [postgis-users] Help with SQL<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">A slight correction to the SQL (JOINs need an ON condition, which in this case is simply TRUE)<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">SELECT <a href="http://poly.id">poly.id</a>, obs_max.*<br>
FROM polyobstacle poly <br>
JOIN LATERAL (SELECT * FROM obstacles o<br>
WHERE ST_Contains(poly.geom, o.geom) <br>
ORDER BY height_m LIMIT 1<br>
) AS obs_max ON true;<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mon, Mar 9, 2020 at 9:28 AM Martin Davis <<a href="mailto:mtnclimb@gmail.com">mtnclimb@gmail.com</a>> wrote:<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-right:0cm">
<div>
<p class="MsoNormal">This is a good case for using a LATERAL JOIN:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">SELECT <a href="http://poly.id" target="_blank">poly.id</a>, obs_max.*<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">FROM polyobstacle poly <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">JOIN LATERAL (SELECT * FROM obstacles o<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> WHERE ST_Contains(poly.geom, o.geom) <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> ORDER BY height_m LIMIT 1<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> ) obs_max<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Mon, Mar 9, 2020 at 2:21 AM <<a href="mailto:paul.malm@lfv.se" target="_blank">paul.malm@lfv.se</a>> wrote:<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-right:0cm">
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">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">I have 2 tables:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">obstacles (point layer) with a column height_m (INTEGER) and 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">polyobstacles (polygon layer)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">the point layer has obstacles all over the map and the polygon layer has some polygons containing some of the obstacle points.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Now I would like to select the highest obstacle in each polygon. If there is several points with the same highest height a random obstacle of those highest shall
be selected.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Is there someone that can get me on the track for such a query, I’m losing myself in subqueries?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Kind regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Paul</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>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt"> </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:9.0pt">
</span><span style="font-size:9.0pt"><img border="0" width="132" height="107" id="gmail-m_2031318179932632170gmail-m_-8375580493621889790Bild_x0020_1" src="cid:image001.jpg@01D5F6CB.6B6E91A0" alt="2_LFV_engelsk_96"></span><o:p></o:p></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
<tbody>
<tr style="height:36.85pt">
<td width="420" valign="top" style="width:315.0pt;padding:0cm 0cm 0cm 2.25pt;height:36.85pt">
<p class="MsoNormal" style="margin-top:2.0pt;mso-margin-bottom-alt:auto;line-height:10.0pt">
<span lang="EN-US" style="font-size:9.0pt;color:#333333"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-top:2.0pt;mso-margin-bottom-alt:auto;line-height:10.0pt">
<b><span lang="EN-US" style="font-size:9.0pt;color:#333333"> Paul Malm</span></b><span lang="EN-US" style="font-size:9.0pt;color:#333333"><br>
<br>
Operations AIM</span><o:p></o:p></p>
</td>
</tr>
<tr style="height:24.1pt">
<td width="420" valign="top" style="width:315.0pt;padding:0cm 0cm 0cm 2.25pt;height:24.1pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;line-height:9.0pt">
<span lang="EN-US" style="font-size:9.0pt;color:#333333"> Direct +46 (0)8 797 70 23 Mobile: +46 (0)708 601115<br>
<a href="mailto:paul.malm@lfv.se" target="_blank">paul.malm@lfv.se</a> </span>
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;line-height:9.0pt">
<span lang="EN-US" style="font-size:9.0pt;color:#333333"> </span><span style="font-size:9.0pt;color:#333333">Mail & Visit: Löjtnantsgatan 25, 115 50 Stockholm, Sweden</span><o:p></o:p></p>
</td>
</tr>
<tr>
<td width="420" valign="top" style="width:315.0pt;padding:0cm 0cm 0cm 2.25pt">
<p class="MsoNormal" style="margin-top:2.0pt;mso-margin-bottom-alt:auto;line-height:9.0pt">
<span lang="EN-US" style="font-size:9.0pt;color:#333333"> Unit phone: +46 (0)8 797 70 20
<br>
</span><span style="font-size:9.0pt;color:#333333"><a href="http://www.lfv.se/" target="_blank"><span lang="EN-US">www.lfv.se</span></a></span><o:p></o:p></p>
</td>
</tr>
<tr style="height:3.7pt">
<td width="420" valign="top" style="width:315.0pt;padding:0cm 0cm 0cm 2.25pt;height:3.7pt">
<p class="MsoNormal" style="margin-top:6.0pt;mso-margin-bottom-alt:auto;mso-line-height-alt:3.7pt">
<span lang="EN-US" style="font-size:9.0pt;color:#00CC00"> Please consider the enviroment before printing this e-mail message.</span><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.0pt"> </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>
<p class="MsoNormal">_______________________________________________<br>
postgis-users mailing list<br>
<a href="mailto:postgis-users@lists.osgeo.org" target="_blank">postgis-users@lists.osgeo.org</a><br>
<a href="https://lists.osgeo.org/mailman/listinfo/postgis-users" target="_blank">https://lists.osgeo.org/mailman/listinfo/postgis-users</a><o:p></o:p></p>
</blockquote>
</div>
</blockquote>
</div>
</div>
</body>
</html>