Carrying out a SUMIF like operation using SQL Server Report Builder

Question

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?

Answer 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))

Answer 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.

Answer 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.

Answer 4

I had similar problem, this worked for me:

=Sum(iif(Fields!date_break.Value = "0001-01-01",Fields!brkr_fee.Value, nothing))

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