Tessitura 'DISTINCT' Parameter filtration in the report dropdown

Hello all, 

This may be covered somewhere but I couldn't find it with searching here. 

If i built a view that has distinct posted_dt and posted_by, like this

select distinct posted_by, posted_dt
from T_BATCH a (nolock)
where posted_by is not null

I would like to have report parameters that return all posted_by between a given date range but DISTINCT.

I run this report for multiple dates and whenever i have multiple dates the users appear multiple times. If a single user posted multiple batches at different points in the date the posted_dt is different. This is all okay. 

However I want to build a report that looks like this - a report that pulls some details between a posting start and end date, but i gives the user the ability to restrict it by who posted the batches. It also only displays users who posted batches in the respective date range. 

The issue is I now get users appearing in my list multiple times. I can't get rid oft he date bit because I need the date bit to filter which users we see as part of the output, but I only want to see distinct users.