#1503 - UNIQUE INDEX必须包含表格分区功能中的所有列

我试图在我的数据库表的MySQL数据库表模式上添加分区为

CREATE TABLE IF NOT EXISTS `users` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `user_group_id` tinyint(3) unsigned NOT NULL DEFAULT '2',
  `username` varchar(50) NOT NULL,
  `email` varchar(80) NOT NULL,
  `password` varchar(50) NOT NULL,
  `first_name` varchar(25) DEFAULT NULL,
  `last_name` varchar(25) DEFAULT NULL,
  `gender` enum('m','f','u') NOT NULL DEFAULT 'u' COMMENT 'm=>Male, f=>Female, u=>Unspecified',
  `profile_image` varchar(255) DEFAULT NULL,
  `reset_key` varchar(50) DEFAULT NULL,
  `block` enum('y','n') NOT NULL DEFAULT 'n' COMMENT 'y=>blocked, n=>notblocked',
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`),
  UNIQUE KEY `username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 CHECKSUM=1 DELAY_KEY_WRITE=1 ROW_FORMAT=DYNAMIC AUTO_INCREMENT=1 ;

当我在表上运行以下分区查询时

ALTER TABLE users PARTITION BY RANGE(id) (
    PARTITION p0 VALUES LESS THAN (200000),
    PARTITION p1 VALUES LESS THAN (400000),
    PARTITION p2 VALUES LESS THAN (600000),
    PARTITION p3 VALUES LESS THAN (800000),
    PARTITION p4 VALUES LESS THAN (1000000),
    PARTITION p5 VALUES LESS THAN (1200000),
    PARTITION p6 VALUES LESS THAN (1400000),
    PARTITION p7 VALUES LESS THAN (1600000),
    PARTITION p8 VALUES LESS THAN (1800000),
    PARTITION p9 VALUES LESS THAN (2000000)
);

它给了我错误信息

#1503 - A UNIQUE INDEX must include all columns in the table's partitioning function

我正在使用MySQL社区服务器 - 5.5.16

可以请任何人告诉我我的查询中有什么错误？