Oracle query problem

Question

Dear All,
i have to calulate percentage of attendence having a mannual flag i.e. 'Y' on datewise and sum up it with all existing dates and then devide it by no of all distinct date in a month for ex..
*percentage=
.......... Count no of attandence having ismannual flag set to be 'Y' on particular date
SUM( ---------------------------------------------------------------------------------------------------------------*100)/Count(Distinct date in a month for a particular department)
........... count total no of candidate present on particular date*
i have to calculate pertantage for each distinct department availabel in table tbltimeregister1
for this i m trying query..
select
DEPARTMENTCODE,sum(sum(decode(ismannual,'Y',1,0))/count(paycode)*100)/COUNT(DISTINCT DATEOFFICE)
from tbltimeregister1
where to_char(dateoffice,'MM/YYYY')='03/2013'
GROUP BY (DEPARTMENTCODE,DATEOFFICE)but it display error not a single group fuction
pl tell me how to calculate it for all the distinct department
with regards
vishal agrawal

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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