MySQL5.7 datetime设置默认为当前时间

DROP TABLE IF EXISTS `strategy`;
CREATE TABLE `strategy` (
  `id` bigint(11) NOT NULL AUTO_INCREMENT COMMENT '自增ID',
  `create_time` datetime(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '创建时间',
  `update_time` datetime(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '修改时间',
  PRIMARY KEY (`id`),
  UNIQUE KEY `strategy_strategyId_uindex` (`strategy_id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin COMMENT='策略配置';

要不datetime、CURRENT_TIMESTAMP都带(3)

`create_time` datetime(3) DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3) COMMENT '创建时间',

要不都不带

`create_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '创建时间',