我有一个表“Bestelling”与4列:“Id”(PK),“KlantId”,“Datum”,“BestellingsTypeId”,现在我想使列Id auto_increment,但是,当我尝试这样做时,出现此错误:MySql无法创建列auto_increment
ERROR 1062: ALTER TABLE causes auto_increment resequencing, resulting in duplicate entry '1' for key 'PRIMARY'
SQL Statement:
ALTER TABLE `aafest`.`aafest_bestelling` CHANGE COLUMN `Id` `Id` INT(11) NOT NULL AUTO_INCREMENT
ERROR: Error when running failback script. Details follow.
ERROR 1046: No database selected
SQL Statement:
CREATE TABLE `aafest_bestelling` (
`Id` int(11) NOT NULL,
`KlantId` int(11) DEFAULT NULL,
`Datum` date DEFAULT NULL,
`BestellingstypeId` int(11) DEFAULT NULL,
PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
任何人都有想法?
咋,但列已经是PK了,所以所有的值都应该是唯一的吧? – 2011-03-23 09:15:53
看看..在违反唯一性约束的状态下,我多次使用MySQL表格。 SELECT ID,COUNT(*)as aafest_bestelling GROUP BY ID HAVING count> 1; – Evert 2011-03-23 09:18:11
它返回0个记录... – 2011-03-23 09:21:10