----------    ----------    ----------
| offers |    |  bids  |    | users  |
----------    ----------    ----------
id            id            id
....          offer_id      first_name
....          user_id       last_name
              ....          .....

offers                   bids                   users
------------------    ----------------------     ----------------
|id| ...| ....|       |id| offer_id| user_id|    |id| first_name| last_name|
------------------    -----------------------     --------------------------
|1 | ...|.....|       |1 |    1    |    2   |    | 2| Peter     | Jackson  |
|2 | ...|.....|       |2 |    1    |    3   |    | 3| Adam      | Black    |
                      |3 |    1    |    6   |    | 4| Roy       | Wright   |
                      |4 |    2    |    5   |    | 5| Eva       | Cekovsky |
                      |5 |    2    |    7   |    | 6| Martin    | Tyson    |
                                                 | 7| Vera      | Vornel   |

offer_id                   full_name
--------------------------------------------------------------
|   1      |    Peter Jackson, Adam Black, Martin Tyson      |
--------------------------------------------------------------
|   2      |    Eva Cekowsky, Vera Vornel                    |
--------------------------------------------------------------