The Qlik Sense logic treats the following as real NULL values:
- NULL values returned from an ODBC connection
- NULL values created as a result of a forced concatenation of tables in the data load script
- NULL values created as a result of a join made in the data load script
- NULL values created as a result of the generation of field value combinations to be displayed in a table
For the last case, we need an option in the presentation options to label these nulls.
I often come up against this in complicated data models and need to show these nulls to the user to maintain the integrity of the data but also label these nulls in a way that is meaningful to the user.