text: CREATE TABLE `sms_coupon_product_relation` (
    `id` bigint(20) unsigned NOT NULL,
    `app_id` bigint(20) unsigned NULL DEFAULT NULL ,
    `coupon_id` bigint(20) DEFAULT NULL,
    `product_id` bigint(20) DEFAULT NULL,
    `product_name` varchar(500) DEFAULT NULL COMMENT '商品名称',
    `product_sn` varchar(200) DEFAULT NULL COMMENT '商品编码',
    `create_by` bigint(20) DEFAULT NULL,
    `update_by` bigint(20) DEFAULT NULL,
    `created_at` timestamp NULL DEFAULT NULL,
    `updated_at` timestamp NULL DEFAULT NULL,
    `deleted_at` timestamp NULL DEFAULT NULL,
    PRIMARY KEY (`id`)
  ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8 COMMENT='优惠券和产品的关系表';