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SQL - Select MAX ( Date ) / Group By

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Last Modified: 2012-08-14
SQL 2005 / 2008

From the below query, I am trying to get MAX ( Rx.FillDate ) for each PLN.PlanCodeKey.

Unfortunately my query returns all Rx.FillDate available for each Pln.PlanCodeKey.

How to fix this issue ? I used MAX Keyword and Group by Clause.
SELECT		PLN.PLANID,PLN.PLANNAME,PLN.BIN,PLN.PlanCodeKey,
			MAX(Case when len(Rx.FillDate) = 7 then dateadd(d, (cast(RIGHT(Rx.FillDate,3) as int) -1), cast(LEFT(Rx.FillDate,4) as DATE))else null end) as [Fill Date],
			Rx.PaidByPlan1,Rx.Plan1StoreId,Rx.Plan1Key
FROM		PLANS PLN
INNER JOIN	Rx Rx
ON			PLN.PlanCodeKey = Rx.Plan1Key
Group By    PLN.PLANID,PLN.PLANNAME,PLN.BIN,PLN.PlanCodeKey,Rx.PaidByPlan1,Rx.Plan1StoreId,Rx.Plan1Key
order by PLN.PlanCodeKey ASC

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