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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Hi Randy,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">This might work in QGIS 3 – it’s untested because I’m currently on a machine with QGIS 2.18 (where the @parent variable is unavailable)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"arial,sans-serif",serif;color:black">aggregate( 'LAYER2','count',"NAME","NAME"=attribute(@parent, 'NAME')) > 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"arial,sans-serif",serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">The other way might be to create a join to your target layer and then select the rows where the value of joined column is not null.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Martin.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Altergott, Randy (CCI-Southwest)<br>
<b>Sent:</b> Tuesday, 18 June 2019 3:41 AM<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> [Qgis-user] Select by Expression with Subquery<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi QGIS users,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m new to QGIS and this is my first question.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can I use QGIS “Select by Expression” to select all features in a vector layer where the “name” field value is also found within another layer (delimited text layer with no geometry)? I get a syntax error when using the
following SQL.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">“NAME” IN (SELECT “NAME” FROM ‘LAYER2’)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m using the “Map Layers” menu to add the layer name, so it actually displays something like ‘LAYER2_ca36271a_8ec7_4aa7_a36c_67418104f66c’ instead of just ‘LAYER2’.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Randy<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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