Select case when convert(char(10),Date1,101) is null then '' else convert(char(10),Date1,101) end as Date1,
case when convert(char(10),Date2,101) is null then '' else convert(char(10),Date2,101) end as Date2,
case when convert(char(10),Date3,101) is null then '' else convert(char(10),Date3,101) end as Date3
from Table1
where id = @id