如何从表格中选择倒数第二行？

Question

表名：- ModelParam_EMS

主键：- ParameterID

行数：- 500

只想499从表中选择第 th 行。

Note :- No. of rows can be less or more but not fixed.

创建表：-

            CREATE TABLE `modelparam_ems` (
              `MakerModelID` smallint(5) unsigned NOT NULL,
              `ParameterID` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
              `Category` tinyint(3) NOT NULL DEFAULT '1',
              `ParameterName` varchar(50) NOT NULL,
              `ParameterAdd` smallint(5) NOT NULL,
              `ParamterType` tinyint(3) unsigned NOT NULL,
              `DataTypeIndex` tinyint(3) unsigned NOT NULL,
              `DefaultResolutionIndex` tinyint(3) unsigned NOT NULL,
              `ParamUnit` varchar(20) NOT NULL,
              `ParamMaxVal` varchar(40) NOT NULL,
              `ParamMinVal` varchar(40) NOT NULL,
              `ParamVal` varchar(40) NOT NULL,
              `CreatedByID` smallint(5) unsigned DEFAULT NULL,
              `CreatedOn` datetime DEFAULT NULL,
              `ModifyById` smallint(5) unsigned DEFAULT NULL,
              `ModifyOn` datetime DEFAULT NULL,
              `chanelno` int(11) DEFAULT NULL,
              PRIMARY KEY (`ParameterID`),
              KEY `MkrMdlId` (`MakerModelID`),
              KEY `DTIndex` (`DataTypeIndex`),
              KEY `ResIndex` (`DefaultResolutionIndex`),
              KEY `CrtByID` (`CreatedByID`),
              KEY `ModfyById` (`ModifyById`),
              KEY `paramTp` (`ParamterType`),
              KEY `Categor` (`Category`),
              KEY `idx_modelparam_ems_parameterid` (`ParameterID`),
              CONSTRAINT `Category` FOREIGN KEY (`Category`) REFERENCES `category_ems` (`categoryid`) ON DELETE CASCADE ON UPDATE CASCADE,
              CONSTRAINT `m2m3` FOREIGN KEY (`MakerModelID`) REFERENCES `makermodel_ems` (`MakerModelID`) ON DELETE CASCADE ON UPDATE CASCADE,
              CONSTRAINT `modelparam_ems_ibfk_1` FOREIGN KEY (`CreatedByID`) REFERENCES `userlogin_ems` (`UserID`) ON DELETE SET NULL ON UPDATE SET NULL,
              CONSTRAINT `modelparam_ems_ibfk_2` FOREIGN KEY (`ModifyById`) REFERENCES `userlogin_ems` (`UserID`) ON DELETE SET NULL ON UPDATE SET NULL
            ) ENGINE=InnoDB AUTO_INCREMENT=10012 DEFAULT CHARSET=utf8;

Answer 1

你可以使用这个：

SELECT *
FROM table_name
ORDER BY column_name DESC
LIMIT n - 1, 1

查询只返回 n-1 行之后的第一行

例如，如果您想获得 products 表中第二贵的产品 (n = 2)，您只需使用以下查询：

SELECT productCode, productName, buyPrice
FROM products 
ORDER BY buyPrice desc 
LIMIT 1, 1

尝试这个。可以在这里测试，没问题。

发现这个网站很有帮助