How do you group by one column and retrieve a row with the minimum value of another column in T/SQL?

Question

So I know this is a pretty dumb question, however (as the rather lengthily title says) I would like to know how do the following:

I have a table like this:

Answer 1

declare @Borg table (
    ID int,
    Foo int,
    Bar int,
    Blagh int
)
insert into @Borg values (1,10,20,30)
insert into @Borg values (2,10,5,1)
insert into @Borg values (3,20,50,70)
insert into @Borg values (4,20,75,12)

select * from @Borg

select Foo,Bar,Blagh from @Borg b 
where Bar = (select MIN(Bar) from @Borg c where c.Foo = b.Foo)