| Field            | Type                | Null | Key | Default | Extra          |
|------------------|---------------------|------|-----|---------|----------------|
| activity_id      | bigint(20) unsigned | No   | PRI | NULL    | auto_increment |
| activity_action  | varchar(45)         | NO   |     | NULL    |                |
| activity_q_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| activity_a_id    | bigint(20) unsigned | YES  | MUL | NULL    |                |
| activity_c_id    | bigint(20) unsigned | YES  |     | NULL    |                |
| activity_user_id | bigint(20) unsigned | NO   | MUL | NULL    |                |
| activity_date    | timestamp           | YES  |     | NULL    |                |

| Field            | Type                | Null | Key | Default | Extra          |
|------------------|---------------------|------|-----|---------|----------------|
| activity_id      | bigint(20) unsigned | No   | PRI | NULL    | auto_increment |
| activity_action  | varchar(45)         | NO   |     | NULL    |                |
| activity_q_id    | bigint(20) unsigned | NO   | MUL | NULL    |                |
| activity_a_id    | bigint(20) unsigned | YES  | MUL | NULL    |                |
| activity_c_id    | bigint(20) unsigned | YES  |     | NULL    |                |
| activity_user_id | bigint(20) unsigned | NO   | MUL | NULL    |                |
| activity_date    | timestamp           | YES  |     | NULL    |                |