Informatica backend query to find a mapping parameter used in a mapping.

select subj.subj_name,map.mapping_name ,param.pv_name from opb_map_parmvar param,opb_mapping map,opb_subject subj
where param.mapping_id=map.mapping_id
and map.subject_id=subj.subj_id
and param.pv_name='$$PARAMETER';