How to show field that not being group?

I have this data:

id             GroupId             DDate                   Value
1                        1            7/31/2008                     5
2                        1            7/31/2008                     6
3                        1            7/31/2008                     2
4                        2            7/31/2008                     1
5                        2            7/31/2008                     2
6                        2            7/31/2008                     1

From this raw dataI want to show the data like this"
GroupId                  DDate                     TotalValue
1                            7/31/2008                            13
2                            7/31/2008                              4

current Query that I Use is

Select D.GroupId,(Select Top 1 DDate From MyTable Where GroupId=D.GroupId)As DDate, Sum(D.Value) As TotalValue From MyTable D Group By D.GroupId

But I want to remove the subquery, so my query will run faster.

Could it be done?