我需要每年打印：电影的标题，年度和排名在前5名剪辑，根据他们的排名年排名。
所以，我需要找到每年收视率最高的5部电影。我试过按年份分组（releases.date），但我也需要标题，并且需要得到每个组的第n个最上面的行。

CLIPS [ id, title ]
RELEASES [ id_clip, date ]
RANKS [ id_clip, nr_votes, ranking ]

有什么提示吗？我正在使用mysql。我也在剪辑表中有年份。

mysql> select * from clip LIMIT 5;
+--------+-----------------------+------+-----------+
| idclip | title                 | year | clip_type |
+--------+-----------------------+------+-----------+
|      4 | !Women Art Revolution | 2010 |         0 |
|      7 | #1                    | 2005 |         0 |
|      8 | #1 (I)                | 2010 |         2 |
|      9 | #1 (II)               | 2010 |         2 |
|     12 | #1 Cheerleader Camp   | 2010 |         2 |
+--------+-----------------------+------

mysql> select * from releasedates LIMIT 5;
+---------+---------------------+---------+
| id_clip | date                | country |
+---------+---------------------+---------+
|       4 | 2010-09-01 00:00:00 | Canada  |
| 1773811 | 2006-01-22 00:00:00 | USA     |
| 1773815 | 2006-02-12 00:00:00 | USA     |
| 1773818 | 2006-02-19 00:00:00 | USA     |
| 1773820 | 2006-01-22 00:00:00 | USA     |
+---------+---------------------+---------+
5 rows in set (0,00 sec)

mysql> select * from ratings LIMIT 5;
+---------+-------+---------+
| id_clip | votes | ranking |
+---------+-------+---------+
|       4 |     8 | 8.0     |
| 1773811 |    51 | 4.5     |
| 1773839 |   753 | 6.3     |
| 1773843 |    32 | 6.9     |
| 1773844 |    18 | 7.1     |
+---------+-------+---------+
5 rows in set (0,00 sec)