错误将db上传到mysql

Question

-- Constraints for table `variation`
--
ALTER TABLE `variation`
  ADD FOREIGN KEY (`parent`) REFERENCES `variation` (`id`),
  ADD FOREIGN KEY (`scale`) REFERENCES `scale` (`id`),
  ADD FOREIGN KEY (`user`) REFERENCES `users` (`user_id`);

--

错误

第 277 行的错误 1452 (23000)：无法添加或更新子行：a 外键约束失败 (getsy.#sql-f44_2a, CONSTRAINT #sql-f44_2a_ibfk_2 外键 (scale) 引用 scale (id))

这个表格变体

CREATE TABLE IF NOT EXISTS `variation` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `parent` bigint(20) DEFAULT NULL,
  `scale` bigint(20) DEFAULT NULL,
  `value` varchar(255) NOT NULL,
  `user` bigint(20) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `parent` (`parent`,`scale`,`value`,`user`),
  KEY `scale` (`scale`),
  KEY `user` (`user`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=101 ;

帮帮我..

谢谢

Answer 1

看起来在variation 表列scale 中包含表scale 列id 中缺少的值。

您可以使用以下查询检查缺失值：

SELECT DISTINCT a.scale FROM 
   variation AS a LEFT JOIN scale AS b ON a.scale = b.id 
WHERE b.id IS NULL;