SSRS- SUM函数如何忽略负值

Question

i want to add only positive values in a aggregate function, ie sum. it should only add positive value. what i am doing is

SUM(((Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value)/(Fields!RemaningDays.Value+1)))

but now i want to ignore the negative values to add.

Answer 1

You need to change the numerator to an IIf expression that will return 0 if the existing value is negative, ie change

Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value

to something like:

IIf(Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value > 0
  , Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value
  , 0)

Depending on the underlying data types, you may need a cast to prevent an aggregation of different data types in the expression and hence #Error being displayed in the report, ie

IIf(Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value > 0
  , Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value
  , CDbl(0))

or

IIf(Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value > 0
  , Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value
  , CDec(0))

So the whole expression will be like:

SUM(((IIf(Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value > 0
      , Fields!MonthlyTarget.Value-Fields!MonthToDateUnits.Value-Fields!DUSales.Value
      , 0))/(Fields!RemaningDays.Value+1)))