MySQL adding foreign key syntax# To add a foreign key to an existing table, you use the ALTER TABLE statement with the foreign key definition syntax above: 1 2 3 4 5 6 ALTER table_name ADD CONSTRAINT constraint_name FOREIGN KEY foreign_key_name(columns) REFERENCES parent_table(columns) ...
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`smb_man`.`busi_table`, CONSTRAINT `busi_table_ibfk_1` FOREIGN KEY (`repo_id`) REFERENCES `repo_table` (`repo_id`)) 3)增加级联操作 mysql> alter table busi_table -> add constraint id_check ->...
http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html 中文网站 http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html 【5】 对外键讲解的比较全面,可以一读 http://www.xiaoxiaozi.com/2009/07/12/1158/ http://feid...
9.1.4.2 The Relationship Editor 9.1.4.3 Connection Properties Foreign key constraints are supported for theInnoDBstorage engine only. For other storage engines, the foreign key syntax is correctly parsed but not implemented. For more information, seeFOREIGN KEY Constraint Differences. ...
【4】mysql官网英文网站 http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html 中文网站 http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html 【5】 对外键讲解的比较全面,可以一读 http://www.xiaoxiaozi.com/2009/07/12/1158/...
MySQL does not perform any sort of action on tbl_name such as deleting rows in response to actions taken on rows in the table which you are defining; in other words, this syntax induces no ON DELETE or ON UPDATE behavior whatsoever. (Although you can write an ON DELETE or ON UPDATE cl...
MySQL adding foreign key syntax To add a foreign key to an existing table, you use the ALTER TABLE statement with the foreign key definition syntax above: ALTER table_nameADD CONSTRAINT constraint_name FOREIGN KEY foreign_key_name(columns) REFERENCES parent_table(columns) ON DELETE...
mysql> alter table busi_table -> add constraint id_check -> foreign key(repo_id) -> references repo_table(repo_id) -> on delete cascade -> on update cascade; --- ENGINE=InnoDB DEFAULT CHARSET=gb2312; //另一种方法,可以替换type=innodb; 3、...
"For storage engines other than InnoDB, MySQL Server parses the FOREIGN KEY syntax in CREATE TABLE statements, but does not use or store it. In the future, the implementation will be extended to store this information in the table specification file so that it may be retrieved by mysqldump ...
然后再设置外键约束: SET FOREIGN_KEY_CHECKS=1; 2. MySQL 5.1.48 导入 MySQL 5.7.18 时遇到 T FOREIGN_KEY_CHECKS = 0 错误的解决方法 #1064 – You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘T FOREIGN...