Analytical function syntax help

Question

The following query sorts by most occuring hesid descedning and requires TWO full table scans of the episodes_full_test table :
create table episodes_full_test (epikey number, hesid number, dob date) tablespace analysis_ip_d;
insert into episodes_full_test values (100, 20, to_date('31-07-1975','DD-MM-YYYY'));
insert into episodes_full_test values (101, 20, to_date('31-07-1975','DD-MM-YYYY'));
insert into episodes_full_test values (102, 20, to_date('31-07-1975','DD-MM-YYYY'));
insert into episodes_full_test values (103, 20, to_date('31-07-1975','DD-MM-YYYY'));
insert into episodes_full_test values (104, 10, to_date('31-07-1985','DD-MM-YYYY'));
insert into episodes_full_test values (105, 30, to_date('31-07-1995','DD-MM-YYYY'));
insert into episodes_full_test values (106, 30, to_date('31-07-1995','DD-MM-YYYY'));
insert into episodes_full_test values (107, 30, to_date('31-07-1995','DD-MM-YYYY'));
commit;
select eft.hesid, eft.epikey, eft.dob
from episodes_full_test eft
join (select hesid, count(hesid) count_hesid
from episodes_full_test
group by hesid) v1
on eft.hesid = v1.hesid
order by v1.count_hesid desc, eft.epikey;     
HESID EPIKEY DOB
20 100 31/07/1975
20 101 31/07/1975
20 102 31/07/1975
20 103 31/07/1975
30 105 31/07/1995
30 106 31/07/1995
30 107 31/07/1995
10 104 31/07/1985
I'm sure there's a way to use analytical functions such that Oracle only needs to perform ONE full table scan of episodes_full_test, but I can't figure out the syntax
Can anyone advise please ?
(Oracle 9r2)
Thanks, Gus

Answer 1

Thank you for providing the create table, insert commands and required output as it makes answering the question much easier (once I'd removed the tablespace specification)
SQL> select hesid, epikey, dob
  2  from
  3      (
  4      select eft.hesid, eft.epikey, eft.dob,
  5          count(*) over (partition by eft.hesid) count_hesid
  6      from episodes_full_test eft
  7      )
  8  order by count_hesid desc;
     HESID     EPIKEY DOB
        20        100 31-JUL-75
        20        101 31-JUL-75
        20        102 31-JUL-75
        20        103 31-JUL-75
        30        105 31-JUL-95
        30        106 31-JUL-95
        30        107 31-JUL-95
        10        104 31-JUL-85
8 rows selected.
SQL>