+--------------+             +--------------+
| article      |             | article_rank |
|--------------|             |--------------|
|id            | <---1:1---o |article_id    |
|title         |             |click         |
|content       |             |read          |
|datetime      |             |score         |
|status        |             |...           |
|category_id   |             |...           |
|user_id       |             |...           |
+--------------+             +--------------+