我试着用下面的CREATE TABLE语句在MySQL中创建一个表:MySQL的:无法创建表
CREATE TABLE `visit` (
`visit_id` int(11) NOT NULL,
`site_id` int(11) DEFAULT NULL,
PRIMARY KEY (`visit_id`),
CONSTRAINT `FK_visit_site` FOREIGN KEY (`site_id`) REFERENCES `site` (`site_id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
我收到此错误:
ERROR 1005 (HY000): Can't create table 'fooschema.visit' (errno: 121)
我用SHOW ENGINE INNODB STATUS命令。这是错误消息:
------------------------ LATEST FOREIGN KEY ERROR ------------------------ 140222 7:03:17 Error in foreign key constraint creation for table `fooschema`.`visit`. A foreign key constraint of name `fooschema/FK_visit_site` already exists. (Note that internally InnoDB adds 'databasename/' in front of the user-defined constraint name). Note that InnoDB's FOREIGN KEY system tables store constraint names as case-insensitive, with the MySQL standard latin1_swedish_ci collation. If you create tables or databases whose names differ only in the character case, then collisions in constraint names can occur. Workaround: name your constraints explicitly with unique names.
然后,我用下面的查询列出所有可用的限制:
select *
from information_schema.table_constraints
where constraint_schema = 'fooschema'
我没有看到任何约束名为“FK_visit_site”的结果。
FK_visit_site约束是表访问的外键约束。我放弃了访问表并尝试重新创建它。
有没有办法可以放弃这个外键约束,即使它关联的表不存在?
你可以只是给你的新密钥一个不同的名字? – Nanne
是的,我可以。但我真的很想用旧的名字。使用旧名称很重要。 – toanong
什么'select * from information_schema。table_constraints其中constraint_name ='FK_visit_site''返回' –