Decode Case statement to insert total text

Question

Where the AGE BRACKET fields are empty or Null I need to insert "Total" text? Can anybody help?
Table
SOURCE CODE     AGE BRACKET     COUNT
CLUBBEN     0-40 Years     3     
CLUBBEN     41-49 Years     6     
CLUBBEN     50-59 Years     38     
CLUBBEN     60-69 Years     205     
CLUBBEN     70-79 Years     181     
CLUBBEN     80+ Years     19     
CLUBBEN          452     
CLUBJUNE     41-49 Years     2     
CLUBJUNE     50-59 Years     21     
CLUBJUNE     60-69 Years     100     
CLUBJUNE     80+ Years     1     
CLUBJUNE          124     
TOTAL          576     
Script Currently entered
SELECT DECODE(GROUPING(F.SOURCE_CODE),1,'TOTAL',0,F.SOURCE_CODE) as "SOURCE CODE",
CASE
WHEN D.AGE BETWEEN '0' AND '40' THEN '0-40 Years'
WHEN D.AGE BETWEEN '41' AND '49' THEN '41-49 Years'
WHEN D.AGE BETWEEN '50' AND '59' THEN '50-59 Years'
WHEN D.AGE BETWEEN '60' AND '69' THEN '60-69 Years'
WHEN D.AGE BETWEEN '70' AND '79' THEN '70-79 Years'
WHEN D.AGE >= '80' THEN '80+ Years'
ELSE ''
END AS"AGE BRACKET",
COUNT(F.MEMBER_COUNT) "COUNT"
FROM A3_FACT_NEW F, DIM_AGE D
WHERE F.AGE_KEY = D.AGE
AND F.JOIN_DATE BETWEEN '25/JUNE/2012' AND '30/AUGUST/2012'
AND F.BEN_TYPE = 'Prime member'
AND F.SOURCE_CODE IN ('CLUBBEN','CLUBJUNE')
GROUP BY ROLLUP(F.SOURCE_CODE,
CASE
WHEN D.AGE BETWEEN '0' AND '40' THEN '0-40 Years'
WHEN D.AGE BETWEEN '41' AND '49' THEN '41-49 Years'
WHEN D.AGE BETWEEN '50' AND '59' THEN '50-59 Years'
WHEN D.AGE BETWEEN '60' AND '69' THEN '60-69 Years'
WHEN D.AGE BETWEEN '70' AND '79' THEN '70-79 Years'
WHEN D.AGE >= '80' THEN '80+ Years'
ELSE ''
END)
ORDER BY(F.SOURCE_CODE),(2)
--------------------------------------------------------------------------------------------------------------

Answer 1

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I have the following table called sales
with sales
as
      select 1 sales_id, 1 prod_id, 1001 inv_num, 120 qty from dual
      union all
      select 2 sales_id, 1 prod_id, 1002 inv_num, 25 qty from dual
select *
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For example in the above sales table, I want to know the total quantity and number of invoice for each product.
The output should look like this
Prod_id   sum_qty   count_inv
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