MySql -按范围和唯一键进行分区

Question

我正在尝试创建下表：

CREATE TABLE `s_relations_with_partition` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `source_persona_id` int(11) NOT NULL,
  `relation_type` int(11) NOT NULL,
  `message_id` int(11) DEFAULT NULL,
  `reply_to_message_id` int(11) DEFAULT NULL,
  `reshare_of_message_id` int(11) DEFAULT NULL,
  `target_object_id` int(11) DEFAULT NULL,
  `target_persona_id` int(11) DEFAULT NULL,
  `created_at` datetime DEFAULT NULL,
  `updated_at` datetime DEFAULT NULL,
  `sent_at` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`,`sent_at`),
  UNIQUE KEY `unique_target_persona` (`source_persona_id`,`relation_type`,`message_id`,`target_persona_id`),
  UNIQUE KEY `unique_target_object` (`source_persona_id`,`relation_type`,`message_id`,`target_object_id`),
  KEY `message_id_index` (`message_id`),
  KEY `reshare_of_message_id_index` (`reshare_of_message_id`),
  KEY `reply_to_message_id_index` (`reply_to_message_id`),
  KEY `source_and_target_object_index` (`source_persona_id`,`target_object_id`),
  KEY `source_target_persona_index` (`source_persona_id`,`target_persona_id`),
  KEY `target_persona_relation_type_message_id_index` (`target_persona_id`,`relation_type`,`message_id`),
  KEY `sent_at_index` (`sent_at`),
  KEY `source_persona_sent_at_index` (`source_persona_id`,`sent_at`),
  KEY `target_persona_sent_at_index` (`target_persona_id`,`sent_at`),
  KEY `target_object_sent_at_index` (`target_object_id`,`sent_at`)
) ENGINE=InnoDB 
PARTITION BY RANGE (sent_at) (
    PARTITION p0 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-01-01 00:00:00') ),
    PARTITION p1 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-02-01 00:00:00') ),
    PARTITION p2 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-03-01 00:00:00') ),
    PARTITION p3 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-04-01 00:00:00') ),
    PARTITION p4 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-05-01 00:00:00') ),
    PARTITION p5 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-06-01 00:00:00') ),
    PARTITION p6 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-07-01 00:00:00') ),
    PARTITION p7 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-08-01 00:00:00') ),
    PARTITION p8 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-09-01 00:00:00') ),
    PARTITION p9 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-10-01 00:00:00') ),   
    PARTITION p10 VALUES LESS THAN (MAXVALUE)
);

我得到了以下错误：

A UNIQUE INDEX must include all columns in the table's partitioning function

向唯一索引添加sent_at (unix时间戳)是不可能的。

对于如何在那个表上实现日期范围分区，有什么想法吗？

Answer 1

然后错误消息本身解释了这个问题。请阅读手册，http://dev.mysql.com/doc/refman/5.1/en/partitioning-limitations-partitioning-keys-unique-k.：

“规则是:在分区表的分区表达式中使用的所有列都必须是表可能拥有的每个唯一键的一部分。简而言之，表上的每个唯一键都必须使用表的分区表达式中的每一列。”