I have results in the following form and would like to filter for only those results matching a session_id=x and an object_id=y, or those first encountered in the results. Any ideas? Session_Id | Object_Id x | y x | y x | z x | z x | z a | b a | b a | c The expected output would be the events outlined in the following table, in which all events matching the first combination of session_id, object_id are allowed, when grouping by session_id. Session_Id | Object_Id x | y x | y a | b a | b ... View more