use test1

SELECT CASE WHEN (dbo.Table_2.dtReception >=dbo.Table_2.dtManipulation AND dbo.Table_2.dtReception >= dbo.Table_2.dtDelivrance) 
			THEN  dbo.Table_2.dtReception
			WHEN  (dbo.Table_2.dtManipulation >=dbo.Table_2.dtReception AND dbo.Table_2.dtManipulation >= dbo.Table_2.dtDelivrance)
			THEN   dbo.Table_2.dtManipulation 
            ELSE   dbo.Table_2.dtDelivrance
END