SSRS Expression Divide by Zero Error

Question

I have a tablix box that has a division expression. When dividing by zero or nulls I get #Error displayed in my report. I tried to create an IIF st

Answer 1

I suspect you're running into the issue where SSRS doesn't actually short circuit an IIF statement; even though you're checking for 0, you're still going to hit a divide by zero error.

Try something like:

=IIf(Sum(Fields!PY_Dollars.Value) = 0, 0, Sum(Fields!CY_Dollars.Value) - Sum(Fields!PY_Dollars.Value))
  / IIf(Sum(Fields!PY_Dollars.Value) = 0, 1, Sum(Fields!PY_Dollars.Value))

Using two IIf statements means you avoid the error by using the equation 0/1 when Sum(Fields!PY_Dollars.Value) = 0, thus just returning 0.

Also note that the above expression is checking Sum(Fields!PY_Dollars.Value) = 0, but yours is checking Sum(Fields!CY_Dollars.Value) = 0 - the denominator needs the zero check here.