As I digitized stuff manually from a raster map and I have a list of all needed features, I want to compare tables.
One complete CSV or Excel, for illustration:
One GeoPackage Table, with missing Feature Codes:
I want to know what
"Feature_Code" are not mapped / missing. Here: 'TH2'.
So far, I searched QGIS and here for any "compare" "table" functions/questions. I also read the QGIS Documentation on Attribute tables.
How do I do this?