Measure SUM vs. SUM(measure)

Question

Problem solved, it was another reason!
Hello,
I have a problem I don't understand. What is the different between using "measure SUM" and "SUM(measure)"? If I use it alone it will both give me correct results, if I use it in another formula the results are different:
sum(m1) = 2
sum(m2) = 1
sum(m1) - sum(m2) = 0 <-- that's wrong
m1 SUM = 2
m2 SUM = 1
m1 SUM - m2 SUM = 1 <-- that's correct, but what is different?
Thank you
Tobias
Message was edited by:
toki

Answer 1

It was a strange kind of problem and unfortunately i cannot regenerate it well.
First there was a calcalation (sum(m1) - sum(m2)) which was accumulated. The sum did not return exaclty the correct value. Then, i tried several formulas, sums, drills I cannot remember all combinations and changed the formula to m1 SUM - m2 SUM and it worked fine. Then, after my posting here I rubbed my eyes as I saw that m1 SUM - m2 SUM now did also returned the wrong result.
I cannot explain this behavior, however, the lost values were caused by NULL-values in some rows (e.g. 5 - NULL = NULL, it should by 5 - 0 = 5), so I added a CASE WHEN m2 IS NULL THEN 0 ELSE m2 END.
Tobias