<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:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" 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=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<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:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Tahoma",sans-serif;
color:#44546A;}
.MsoChpDefault
{mso-style-type:export-only;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
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="EN-ZA" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">I need help with structuring a SQL statement to query out data from an Oracle database, using SQL Developer. I want to query out entities that have only one boundary, as opposed
to entities that have disjointed boundaries, or have islands.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">I have tried to write queries that use the difference in structure of the SDO_GEOMETRY field, between entities with one boundary only, as opposed to entries with multiple boundaries
or islands. Is this the route to follow, or is there a simpler method?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">Typically, the SDO_GEOMETRY of entities that have multiple islands starts like this:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">MDSYS.SDO_GEOMETRY(2003,NULL,MDSYS.SDO_POINT_TYPE(NULL,NULL,NULL),</span>
<span style="font-family:"Tahoma",sans-serif;color:#44546A">MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1,931,2003,1),MDSYS.SDO_ORDINATE_ARRAY( . . .,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">whereas SDO_GEOMETRY of entities that have no islands starts like this:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">MDSYS.SDO_GEOMETRY(2003,NULL,NULL,MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1),MDSYS.SDO_ORDINATE_ARRAY( . . .<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A">Any suggestions would be welcome.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Mike Caister<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Spatial Database Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Survey Technician ST1397<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Office of the Surveyor General: KwaZulu-Natal<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">300 Pietermaritz Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">PO Box 396<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Pietermaritzburg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">3200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Email:
</span><span style="color:#44546A"><a href="mailto:macaister@sgkzn.gov.za"><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:blue;mso-fareast-language:EN-ZA">Mike.Caister@drdlr.gov.za</span></a></span><span style="font-size:8.0pt;font-family:"Tahoma",sans-serif;color:#1F497D;mso-fareast-language:EN-ZA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Tel: 033 355 2929<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#44546A;mso-fareast-language:EN-ZA">Fax: 033 394 7610<b>
<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="color:#44546A;mso-fareast-language:EN-ZA"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>