OTBI report how to display parameter list of values only with the report result in the list ?

Hello ,

In OTBI report, we would like to have a list of values on parameter “location “ based on the values of the report result . 

Only the values that are extracted from the location field when the report runs. not more than that. 

When I create a new parameter based on a COLUMN VALUE parameter, and choose the location field .

I edit the parameter ,pick list of values to be SQL And choose the SQL below. This sql is automatically filled up by the OTBI ans is like the query 

 of the report from the subject area of the workers, but yet the result is all locations in the system not only those on the report result.