SUM function in a calculation

Question

Hi All,
Hope all is well. I'm at an early beginner level with Discoverer/Oracle
a) Have a calc to determine how many weeks it took from when the course ended that the instructor handed in the grade.
Calc_DateDiff
ROUND(( TRUNC(Final Grade Date)-TRUNC(Meeting Time.End Date) )/7)
b) If (a) is less than 7 weeks, then it is ON TIME otherwise it is LATE
so i created these 2 calcs:
1) calc_ontime CASE WHEN Calc_DateDiff < 7 THEN 1 ELSE 0 END
2) calc_late CASE WHEN Calc_DateDiff < 7 THEN 0 ELSE 1 END
c) would like to summarize by Course id, total handed in on time, total handed in late
but the following calc creates a column with nothing in it:
SUM(*calc_ontime*) OVER(PARTITION BY Student Course.Course ID )
so i tried replacing the calc with the code behind the scenes of calc_ontime, and also, the calc column is empty:
SUM(CASE WHEN Calc_DateDiff < 7 THEN 1 ELSE 0 END) OVER(PARTITION BY Student Course.Course ID )
so i tried replacing calc_datediff, with it's formula and am getting a syntax error that i cannot solve:
SUM(CASE WHEN ROUND(( TRUNC(Final Grade Date)-TRUNC(Meeting Time.End Date) )/7) < 7 THEN 1 ELSE 0 END) OVER(PARTITION BY Student Course.Course ID )
and it's not liking the End Date field, even though i pasted it from the folder.....
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Do you have any ideas how i can SUM the calc_ontime and calc_diff field, bec once i have the sums
i need to divide into the total class pop to come up with a percentage of how many students handed in on time
and how many students handed in late.
or should i create a function for dba to register into Discoverer that would do this, where i would feed in the course id
as a parameter?
SELECT SUM(CASE WHEN ROUND(( TRUNC(Final Grade Date)-TRUNC(Meeting Time.End Date) )/7) < 7 THEN 1 ELSE 0 END)
FROM student course
,MEETING TIME
WHERE student course = parm_course
GROUP BY OVER(PARTITION BY Student Course.Course ID )
pls advise, tx for your help, sandra

Answer 1

Hi Michael,
a) i understand what you wrote about DATE in a field with an embedded space could be misunderstood by Discoverer
as the keyword date.
b)putting quotes around meeting time.end date - did not work for me....
( in the past, i have seen quotes around a field, when i typed a field name incorrectly, so when i see a field in quotes in a calc - i would generally guess that it is an undefined field..... that needs to be fixed for calc to work)
c) can i back pedal:
this is one of orig formulas:
ROUND(( TRUNC(Final Grade Date)-TRUNC(Meeting Time.End Date) )/7)
i create more calcs:
calc_FinalGradeDate:
TRUNC(Final Grade Date)
calc_EndDate
TRUNC(Meeting Time.End Date)
then i went back to calc_DateDiff and wrote this:
ROUND( Calc_FinalGradeDate - Calc_EndDate/7)
i got a data type error......
do you think that any field with an embedded space that has DATE in it would cause problems, and that i would
have to go to Discoverer Admin to put in hyphens?
any ideas for above would be greatly appreciated, tx, sandra