SSRS - Boolean Parameter to pick max date

Question

I'm trying to create a Boolean parameter that would perform the following:
If the user indicates True, the report will return rows with the most recent date, rather than show duplicates.
If left False, the report runs as normal, pulling each row and leaving the duplicates.
SSRS doesn't appear to allow me to say something like =IIF(Parameters!MaxDate=1, Fields!MaxCreatedDate, Nothing) in an expression anywhere. When I try, I receive an error telling me "Fields cannot be used in query parameter expressions". Does
anyone have an idea of how I could accomplish this?
Thanks.

Answer 1

You need to do this at query behind I believe
write the filter logic as below
SELECT Columns...
FROM
SELECT *,ROW_NUMBER() OVER (PARTITION BY GRoupFields ORDER BY DateField DESC) AS Seq
FROM Table
)t
WHERE Seq = 1
OR @BooleanParameter = 0
where GroupedFields is feilds for which you need to get distinct list.
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