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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Hello Uwe,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">you could try this:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma",sans-serif">select * from my_lines l join my_polys p on l.my_line_attribute like '%' + p.my_poly_attribute + '%'</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Best regard<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Michael<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:DE">Von:</span></b><span style="mso-fareast-language:DE"> Qgis-user <qgis-user-bounces@lists.osgeo.org>
<b>Im Auftrag von </b>Uwe Fischer via Qgis-user<br>
<b>Gesendet:</b> Montag, 24. Oktober 2022 13:52<br>
<b>An:</b> qgis-user@lists.osgeo.org<br>
<b>Betreff:</b> [Qgis-user] query for Virtual Layer in relation to another layer<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p style="line-height:10.0pt;background:#D5EAFF"><span style="font-size:10.0pt;font-family:"Time new Roman",serif;color:red">ACHTUNG!!</span><span style="font-size:10.0pt;font-family:"Time new Roman",serif"> Diese E-Mail erreicht Sie von einem Absender außerhalb
der niedersächsischen Landesverwaltungs-Infrastruktur mit TLS-Verschlüsselung. Bitte klicken Sie auf keine Links oder öffnen Sie keine E-Mail-Anhänge, falls Sie den Absender nicht kennen und nicht wissen, ob der Inhalt sicher ist.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">I am looking for a way to create a virtual layer in 3.24 in a 'special' way. I have a line layer with attributes like:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Verdana",sans-serif">xxxx_123_xxxxxxxxx<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Verdana",sans-serif">oooo_abc_000_123_0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">and a polygon layer with attributes like:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Verdana",sans-serif">abc<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Verdana",sans-serif">123<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Now, I would like to use only lines that contain one of the strings that are present in the polygon layer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">A prototype for the SQL query might be:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span style="font-family:"Verdana",sans-serif">select * from my_lines where my_line_attribute in (select my_poly_attribute from my_polys)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">The problem is that I cannot use the IN clause because the line attributes contain additional surrounding characters around the polygon attributes. The surrounding characters can be any token,
so it is not possible to remove them in a systematic way prior to the query. I thought about working with '%123%'. But how do I put every possible value in my_poly_attribute in that clause? That is, '%123%' would have to be in the query as well as '%abc%'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Thanks a lot for ideas!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif;mso-fareast-language:DE">Regards, Uwe<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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