问题
I'm trying to produce a conditional sum in SQL Server Report Builder 3.0.
My expression looks like this:
=Sum(Iif(Fields!ProjectTypeID.Value=2,Fields!kWp.Value,0))
I'd hoped that this expression would produce a sum of the kWp of all projects of type 2.
Unfortunately, it is not to be. And I can't seem to work out why. It just returns a 0 result, even though I know that there are non-zero values in the kWp column, and the column does not contain nulls.
A colleague did manage to get a positive result by replacing the
Fields!kWp.Value
with
1 * Fields!kWp.Value
But we have no idea why this works, and therefore, can't really trust the answer.
How can I get this conditional sum to behave itself?
回答1:
The data type of the column 'kWp' is Decimal so you need to either convert the default value to 0.00 or cast the column to double
SUM(iif(Fields!ProjectTypeID.Value = 2,cdbl(Fields!kWp.Value),0.00))
回答2:
To get the sum of the kWp of all projects of type 2, the expression is as follows,
=IIf(Fields!ProjectTypeID.Value=2,sum(Fields!kWp.Value),0)
I hope this will help u.
回答3:
To get the conditional sum you can try this expression
=sum(IIf(Fields!balance.Value > 0,(Fields!balance.Value),0))
It sums only positive numbers otherwise it adds 0 to the total, you can do it wise versa.
回答4:
I had similar problem, this worked for me:
=Sum(iif(Fields!date_break.Value = "0001-01-01",Fields!brkr_fee.Value, nothing))
zb
来源：https://stackoverflow.com/questions/11030273/carrying-out-a-sumif-like-operation-using-sql-server-report-builder