John,

I don't know of a way or formula that works for this in the query, I generally will create this type of query in either a SQL query or SEI. 

A couple different workarounds.

1. Create a SQL view under "development > Data and parameter > views". You can use SQL comment to make your selection unique, then you can pull in into a Graphical Query as a regular table.

2. In the Graphical Query, create a group for the fields that are unique in your query. So when you "Level -", you can see the unique result by group. 

Yes, the 2nd option can work but it's not the prettiest option.