mysql> select * from videos
    -> ;
+----+--------------+----------------+---------------------+---------------------+
| id | videoable_id | videoable_type | created_at          | updated_at          |
+----+--------------+----------------+---------------------+---------------------+
|  1 |            1 | Assignment     | 2011-02-13 23:00:49 | 2011-02-13 23:00:58 |
|  2 |            1 | Assignment     | 2011-02-13 23:00:56 | 2011-02-13 23:00:58 |
+----+--------------+----------------+---------------------+---------------------+


mysql> select * from assignments;
+----+---------------------+---------------------+
| id | created_at          | updated_at          |
+----+---------------------+---------------------+
|  1 | 2011-02-13 23:00:58 | 2011-02-13 23:00:58 |
+----+---------------------+---------------------+
1 row in set (0.00 sec)