repeated values?

[websalacarta]

hi, I´m using oracle,

I´d like to have the repeated columns

example:

id           value
1              5
2              5
3              8
4              9
5              3
6              8

I´d like to have this result:

value
5
8

any help?
thanks

[swampBoogie]

select value 
from t
group by value
having count(*) > 1