Unable to display data no entry in the table without using Model clause

Question

Hi,
I've an urgent requirement described below :
The previously posted Question has been answerted using Model Clause:
Is there any way out to solve it without using Model clause:
I've a table named as "sale" consisting of three columns : empno, sale_amt and sale_date.
(Please ref. The table script with data as given below)
Now if I execute the query :
"select trunc(sale_date) sale_date, sum(sale_amt) total_sale from sale group by trunc(sale_date) order by 1"
then it displays the data for the dates of which there is an entry in that table. But it does not display data for the
date of which there is no entry in that table.
If you run the Table script with data in your schema, then u'll see that there is no entry for 28th. Nov. 2009 in
sale table. Now the above query displays data for rest of the dates as its are in sale table except for 28th. Nov. 2009.
But I need its presence in the query output with a value of "sale_date" as "28th. Nov. 2009" and that of "total_sale" as
"0".
Is there any means to get the result as I require?
Please help ASAP.
Thanks in advance.
Create table script with data:
CREATE TABLE SALE
EMPNO NUMBER,
SALE_AMT NUMBER,
SALE_DATE DATE
SET DEFINE OFF;
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('12/01/2009 10:20:10', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/30/2009 10:21:04', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/29/2009 10:21:05', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/26/2009 10:21:06', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/25/2009 10:21:07', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 5000, TO_DATE('11/27/2009 10:23:06', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 4000, TO_DATE('11/29/2009 10:23:08', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 3000, TO_DATE('11/24/2009 10:23:09', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 2000, TO_DATE('11/30/2009 10:23:10', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 7000, TO_DATE('11/24/2009 10:24:19', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 5000, TO_DATE('11/25/2009 10:24:20', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 3000, TO_DATE('11/27/2009 10:24:21', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 2000, TO_DATE('11/29/2009 10:24:22', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 1000, TO_DATE('11/30/2009 10:24:22', 'MM/DD/YYYY HH24:MI:SS'));
COMMIT;
Any help will be needful for me
Regards,

Answer 1

select sale_date,sum(sale_amt) total_sale
from
select empno,0 sale_amt,(sale_date + ao.rn) sale_date
from
select empno,sale_amt,sale_date ,(t.nxt_dt - t.sale_date) diff
from
select empno
,sale_amt,trunc(sale_date) sale_date
,trunc(nvl(lead(sale_date) over (partition by 1 order by sale_date),sale_date)) nxt_dt
from sale
) t
where (t.nxt_dt - t.sale_date) >1
) rec,(select rownum rn from user_objects where rownum<=200) ao
where ao.rn <=(rec.diff-1)
union all
select empno,sale_amt,trunc(sale_date) sale_date
from sale
group by sale_date
order by 1;
~~~~Guess this will serve the purpose...
Cheers Arpan