mysql的建表语句

CREATE TABLE `delivery_id_pool` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '自增id',
  `delivery_id` varchar(100) NOT NULL COMMENT '运单号',
  `status` tinyint(1) DEFAULT '1' COMMENT '状态[1:已使用,0:未使用]',
  `batch_id` int(11) DEFAULT NULL COMMENT '批次号',
  `create_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00' COMMENT '创建时间',
  `update_time` datetime DEFAULT NULL COMMENT '更新时间',
  `yn` tinyint(1) DEFAULT '1' COMMENT '是否有效',
  `ts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '时间戳',
  PRIMARY KEY (`id`,`create_time`),
  KEY `idx_delivery_id` (`delivery_id`)
) ENGINE=InnoDB AUTO_INCREMENT=2646421 DEFAULT CHARSET=utf8 COMMENT='运单号缓存池表-手工生成运单号'  ;