Discoverer: "CASE WHEN...." in calculations won't show anything in GUI !?!?

Question

Hi all!
I have a report in Discoverer Plus (Version 10.1.2.48.18) which contains 2 columns: One with actual spendings and one with budget figures. I want to make a third column which holds actual spendings in percentage of the budget. To do this, I need to make a calculation similar to:
CASE WHEN SUM(budget) <> 0 THEN SUM(spendings)/SUM(budget) ELSE NULL END
However, when I apply this calculation to the third column, my report don't return any numbers at all in any column.
What am I doing wrong? -- Is this a bug, and how should I solve my problem?
~Morten

Answer 1

I can get something out if I do this (applying an aggregate function to it all):
SUM(CASE WHEN budget <> 0 THEN spendings/budget ELSE NULL END)
However, this is wrong (Summarizing these percentages doesn't give any meaning).
SQL lookes something like this:
SELECT /*+ NOREWRITE */ o100448.ACCOUNT as E100451,(decode((ADD_MONTHS(o100862.DATE1,-4)),null,to_date(null, 'MMDDYYYY'),to_date(to_char(trunc((ADD_MONTHS(o100862.DATE1,-4)),'YYYY'),'YYYY') || '01','YYYYMM'))) as E101004,MAX(o100448.ACCOUNTNUM) as as100473_100451_NEW,CASE WHEN ( SUM(o100862.BUDGET) ) <> 0 THEN ( SUM(o100862.AMOUNT) )/( SUM(o100862.BUDGET) ) ELSE NULL END as C_1,( SUM(o100862.BUDGET) )*o100448.SIGN as C_3,( SUM(o100862.AMOUNT) )*o100448.SIGN as C_2,GROUPING_ID(o100448.ACCOUNT,o100448.SIGN,(decode((ADD_MONTHS(o100862.DATE1,-4)),null,to_date(null, 'MMDDYYYY'),to_date(to_char(trunc((ADD_MONTHS(o100862.DATE1,-4)),'YYYY'),'YYYY') || '01','YYYYMM')))) as GID
FROM TANGO.TANGO_ACCOUNTS o100448,
TANGO.TANGO_SUMS o100862
WHERE ( (o100862.ORG = o100448.ORG AND o100862.ACCOUNTNUM = o100448.SUBACCOUNTNUM))
AND (o100448.ACCOUNTNUM BETWEEN 30000 AND 79999)
AND (o100862.DIM = '50')
AND (o100448.ORG = 'bru')
GROUP BY GROUPING SETS(( o100448.ACCOUNT,o100448.SIGN,(decode((ADD_MONTHS(o100862.DATE1,-4)),null,to_date(null, 'MMDDYYYY'),to_date(to_char(trunc((ADD_MONTHS(o100862.DATE1,-4)),'YYYY'),'YYYY') || '01','YYYYMM'))) ),( o100448.ACCOUNT,(decode((ADD_MONTHS(o100862.DATE1,-4)),null,to_date(null, 'MMDDYYYY'),to_date(to_char(trunc((ADD_MONTHS(o100862.DATE1,-4)),'YYYY'),'YYYY') || '01','YYYYMM'))) ))
HAVING (GROUP_ID()=0)
ORDER BY GID DESC;
I tried to fire this SQL up in TOAD (or whatever SQL-tool you might have), and columns C_2 and C_3 are empty. Seems like I'm doing something awfully wrong here.....
Any ideas? (There must be some SQL sharks out there ;-p)
~Morten