I already asked about this topic, but I am still struggling. I created a geopackage with railways of Germany. I need to filter some sections out. I understand that geopackages work with SQL syntax for filtering. But when I use syntax I looked up, QGIS is not doing what its supposed to do.
I just want the railways without the tunnels. I used
"tunnel" IS NULL;.
It is successful. No warning is displayed, but all the railways are gone. I use the filter function of the layer. no the query builder.
What do I have to change?
"tunnel" NOT LIKE 'yes'makes any difference.