Which query will have a better performance? a) SELECT count(), request_type_name FROM KCRT_REQUEST_TYPES WHERE request_type_id IN (SELECT request_type_id FROM kcrt_requests) GROUP BY request_type_name; OR b) SELECT count(), request_type_name FROM kcrt_requests kr,kcrt_request_types krt WHERE kr.request_type_id = krt.request_type_id GROUP BY request_type_name ;