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How to select unique domain values that are not shared with other attribute values?

I’m trying to find the courses (knamn) that only Lennart have taught in but not Alan or Kjell.

The result should look like this:

How do I retrieve the view above from the following table below (this table is called z);

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Answer

only Lennart have taught…

With conditional aggregation:

See the demo.
Results:

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