Get one record for all group?
===

    id | group | text
    1  | 1     | sadsd
    2  | 1     | sdffs
    3  | 1     | sdffs
    4  | 2     | sdf
    5  | 2     | sdfs
    6  | 3     | sdfsdf
    7  | 4     | 243
    8  | 4     | dfgd

How can i get with SQL all group, but only one? I would like show:

    group:
    1
    2
    3
    4

Other example:

    id | group | text
    1  | v     | sadsd
    2  | b     | sdffs
    3  | n     | sdffs
    4  | v     | sdf
    5  | v     | sdfs
    6  | n     | sdfsdf
    7  | m     | 243
    8  | b     | dfgd
How can i get with SQL all group, but only one? I would like show:

    group:
    v
    b
    n
    m