报表生成器 (SSRS) SWITCH 语句空白值

Question

For a report I'm building, there are fields that are dependent on a user selecting to add additional people to their policy (named in the dataset as dependent1, dependent2, etc).

We need to determine whether these dependants are adults or children for reporting. This will be done via DOB and a DateDiff which I understand

Currently, I can get the report to show ADULT or CHILD if data is present, however if there isn't any data I can't return a "" value, it just defaults to ADULT .

I'm using:

=Switch(DateDiff("yyyy", Fields!Dependant1DoB.Value, Fields!Policy_Start_Date.Value) < 18, "CHILD", 
        DateDiff("yyyy", Fields!Dependant1DoB.Value, Fields!Policy_Start_Date.Value) >= 18, "ADULT", 
        DateDiff("yyyy", Fields!Dependant1DoB.Value, Fields!Policy_Start_Date.Value), "")

I also created another column which uses the DateDiff between Fields!Dependant1DoB.Value & Fields!Policy_Start_Date.Value to show the number of years. This works and returns a number. however for some unknown reason where there's no data it still returns "2019" which may be effecting it? I've tried including this in the Switch statement ( DateDiff("yyyy",Fields!Dependant1DoB.Value,Fields!Policy_Start_Date.Value)=2019, "") ) but this still doesn't work.

Someone please help as this is driving me loopy!

Answer 1

You need to first check for nothing and then apply the switch function, example below:

=IIF(IsNothing(Fields!Dependent1DoB.Value),"", Switch( DateDiff("yyyy",Fields!Dependent1DoB.Value,Fields!Policy_Start_Date.Value)<18, "CHILD", DateDiff("yyyy",Fields!Dependent1DoB.Value,Fields!Policy_Start_Date.Value)>=18, "ADULT" ) )