MySQL創建雙主鍵

如下：

CREATE TABLE `loginlog` (
  `id` int(10) unsigned zerofill NOT NULL AUTO_INCREMENT COMMENT '主鍵編號',
  `IP` varchar(100) NOT NULL COMMENT 'ip地址主鍵',
  `version` int(11) NOT NULL DEFAULT '1' COMMENT '登錄次數',
  `address` varchar(100) NOT NULL COMMENT '登錄地址',
  `loginTime` TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '當前登錄時間',
  `lastLogin` TIMESTAMP(3) NOT NULL DEFAULT '0000-00-00 00:00:00.000' COMMENT '最后登錄時間',
  PRIMARY KEY (`id`,`IP`),
  UNIQUE KEY `id` (`id`)
) ENGINE=INNODB DEFAULT CHARSET=utf8 COMMENT='登錄信息表';