How to return primary key from oracle merge query

I want to return the primary key from an oracle merge query. I'm using a single statement to insert if not exist and I don't want to use procedure or function to do so..

this is the sample query

merge into myTable e
  using (select :empname name from dual) s
  on (UPPER(TRIM(e.empname)) = UPPER(TRIM(s.name)))
  when not matched then insert (empname) 
    values (s.name)

and I need to get another primary key field of the myTable. the primary key is inserted using sequence and trigger

I tried adding RETURNING empID into :empId but it gives error