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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Hello group,<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-GB" style="font-family:"Tahoma",sans-serif">I’ve added a WFS-layer to a project try to define filters on different attributes. It seems not to be possible to filter for NULL values.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">Example:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">1932 records in total<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">376 records with a value in a date attribute<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">20 records with 2005-12-31 as value<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">If I set the filter to "end_date" = '2005-12-31' the result is 20 records.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">If I set the filter to "end_date" != '2005-12-31' the result is 356 records. So only records that have an end date are recognized. Record with NULL as end date are ignored.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">Filtering in the attribute table with “is_empty_or_null” works but only for selection.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">Is this “normal” behaviour with WFS layers or is there a way to define a filter string that work for all records?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif">QGIS-Version is 3.40.4-Bratislava<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif;mso-fareast-language:DE">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:"Tahoma",sans-serif;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;mso-fareast-language:DE">Michael<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:DE">*****************************************
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:DE">Michael Reetz<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Tahoma",sans-serif;mso-fareast-language:DE">Datenbanken und Anwendungsentwicklung<br>
Nationalpark-Verwaltung Niedersächsisches Wattenmeer <br>
Virchowstr. 1 | 26382 Wilhelmshaven <br>
Tel.: +49 (0) 4421 911 291 <br>
e-mail: <a href="mailto:michael.reetz@nlpv-wattenmeer.niedersachsen.de"><span style="color:blue">michael.reetz@nlpvw.niedersachsen.de</span></a>
<br>
Web: <a href="https://www./"><span style="color:blue">https://www.</span></a><u><span style="color:blue">nationalpark-wattenmeer.de</span></u>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><img border="0" width="219" height="118" style="width:2.2812in;height:1.2291in" id="Grafik_x0020_1" src="cid:image003.png@01DC16A8.F8DA11B0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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