Question

我必须从一个表中删除多个ID，不幸的是，“ I” ID分散在整个列中。

有什么办法可以压缩这种类型的查询？

DELETE FROM table 
WHERE 
  I1 = 1 OR I2 = 1 OR I3 = 1 OR I4 = 1 OR I5 = 1 OR 
  I6 = 1 OR I7 = 1 OR R1 = 1 OR R2 = 1 OR R3 = 1;

表格：

DROP TABLE IF EXISTS `recipes`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `recipes` (
  `ID` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `I1` smallint(5) unsigned NOT NULL,
  `I2` smallint(5) unsigned NOT NULL,
  `I3` smallint(5) unsigned NOT NULL,
  `I4` smallint(5) unsigned NOT NULL,
  `I5` smallint(5) unsigned NOT NULL,
  `I6` smallint(5) unsigned NOT NULL,
  `I7` smallint(5) unsigned NOT NULL,
  `I8` smallint(5) unsigned NOT NULL,
  `R1` smallint(5) unsigned NOT NULL,
  `R2` smallint(5) unsigned NOT NULL,
  `R3` smallint(5) unsigned NOT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=MyISAM AUTO_INCREMENT=3500 DEFAULT CHARSET=utf8 AVG_ROW_LENGTH=79;
/*!40101 SET character_set_client = @saved_cs_client */;

Answer 1

在条件值匹配时尝试以下查询

DELETE FROM table WHERE 1 in (I1,I2,I3,I4,I5,I6,I7,R1,R2,R3);

Answer 2

您可以CONCAT在其中可以包含id的所有列，并查看结果字符串中是否包含序列“ comma-id-comma”，如下所示：

SELECT * FROM recipes WHERE CONCAT(',' , I1, I2, I3, I4, I5, I6, I7, I8, R1, R2, R3, ',') LIKE '%,1,%'

请注意concat开头和结尾的逗号，这是正确检查I1和R3列所必需的。

浓缩多个OR条件

2 个答案: