SQL max value

I need to join 2 tables, work and active by case and then find the max(dt_run)in the active table. I came up with the following SQL, but is there a better way? Tables will be large and the actual SQL is much more involved. Oracle 8.1.7.2.0.

select a.case, a.dt_run
from active a, work w
where a.case = w.case
group by a.case, a.dt_run
having a.dt_run = (select max(dt_run) from active where a.case = case group by case)

results
CASE DT_RUN
 1 15-JAN-03
 2 15-DEC-02 create table active ( dt_run date, case number); create table work ( dt_run date, case number);

Work table data

DT_RUN                                                      CASE 
15-FEB-03                                                     1
15-NOV-02                                                     2

Active table data
DT_RUN                                                      CASE 
15-JAN-03                                                     1
15-DEC-02                                                     1
15-NOV-02                                                     1
15-NOV-02                                                     2
15-DEC-02                                                     2