Cannot add foreign key constraint 问题原因 要关联的字段在要关联的表中不是主键。 解决方案 此处以tstudent表和tscore表为例说明如何解决此问题。 执行如下SQL语句,查看tstudent表结构,判断要关联的字段在要关联的表中是不是主键。 show create table tstudent; 系统显示类似如下,确认ts
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS; 示例: mysql> CREATE TABLE child ( -> id INT(10) NOT NULL PRIMARY KEY, -> parent_id INT(10), -> FOREIGN KEY (parent_id) REFERENCES `parent`(`id`) -> ) ENGINE INNODB; ERROR 1215 (HY000): Cannot add foreign key constraint # ...
1、名(name):可以不填,保存时会自动生成。 2、栏位(FieldName):要设置的外键 3、参考数据库(Reference DataBase):外键关联的数据库 4、被参考表(Reference Table):关联的表 5、参考栏位(Forgin filed Names):关联的字段 6、删除时(ondelete):删除时候的动作 7、更新时(onupdate):更新时候的动作 以上字段...
, `key` varchar(255) NOT NULL, `created` datetime NOT NULL ); 0 row(s) affected Records: 0 Duplicates: 0 Warnings: 0 ALTER TABLE `tastypie_apikey` ADD CONSTRAINT `user_id_refs_id_56bfdb62` FOREIGN KEY (`user_id`) REFERENCES `auth_user` (`id`); Error Code: 1215. Cannot add ...
mysql外键:error:1215 - Cannot add foreign key constraint,Mysqlforeignkey不能添加常见原因: 个人原创转载注明出
mysql中，两个表要建外键必须都是InnoDB表，MyISAM表暂时不支持外键，估计就是引擎的问题 create
不能添加外键，检查下你的语法是否正确，外键约束是否正确
Bug #79918 Cannot add foreign key constraint Submitted: 11 Jan 2016 16:52Modified: 18 Apr 2019 16:25 Reporter: Stefano Giacone Email Updates: Status: Duplicate Impact on me: None Category: MySQL Server: InnoDB storage engineSeverity: S1 (Critical) Version: 5.7.10OS: Any (Win7 and ...
当您在MySQL中遇到“cannot add or update a child row: a foreign key constraint fails”错误时,这通常意味着您试图插入或更新一张表中的行,但这与另一张表中存在的外键约束相冲突。下面是对这一错误的详细分析和解决步骤: 1. “foreign key constraint fails”错误的含义 这个错误表明,您在尝试添加或更新一...
I am new to learning SQL and I have a project that just doesnt make sense to me. Now when I type in the following code down below down, I get hit with the message "Cannot add foreign key constraint". The whole idea of adding foreign keys into SQL code is super confusing. HELP!!!