have you tried
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Hi Abaid Khalid,
As you mention your column contains string values so you can use the Edit Alias option .
Below is an example for the same,Consider the category column has null values
In the above screenshot i have replaced the Furniture Value with Null .
Hope this solves your problem.
When I try to change the aliases, it produces the following error.
Cannot assign two members the same value (alias).
Null is already aliased as Null
I tried this and this result in column of undefined values.
You can try and Group the Null and blank values to one as "Null"
I have grouped them, but I can't assign them Null.
Can you guide me please?
Could you share a screenshot if possible or a sample file?