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 ->...
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 ->...
Let’s examine the syntax in greater detail: The CONSTRAINT clause allows you to define constraint name for the foreign key constraint. If you omit it, MySQL will generate a name automatically. The FOREIGN KEY clause specifies the columns in the child table that refers to primary key columns ...
I thought by adding the foreign key and restraints, I could ensure that noone could add new records to the rlbbulbs table without having a brandID added as well. I know I didnt use correct syntax in describing my tables, but I dont know how to do that here in this forum. lol Hope ...
http://www.cppblog.com/wolf/articles/69089.html 【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...
repo_id char(13) not null primary key, repo_name char(14) not null) type=innodb; 创建表2 mysql> create table busi_table( -> busi_id char(13) not null primary key, -> busi_name char(13) not null, -> repo_id char(13) not null, ...
CREATE TABLE Orders ( O_Id int NOT NULL, OrderNo int NOT NULL, Id_P int, PRIMARY KEY (O_Id), FOREIGN KEY (Id_P) REFERENCES Persons(Id_P) ) 在看书的时候遇到了这个问题,原文使用的是postgreSQL,我换成了MySQL。对SQL语句还不慎了解,不知道上面的语法是否有错误?,但执行时未发现syntax报错,只有...
- support SQL standard syntax instead of InnoDB syntax. I use the abbreviation FK when discussing the child / referencing table (the table with the foreign key), or its indexes and columns. I use the abbreviation PK when discussing the parent / referenced table (which is often a table with...
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...
FOREIGN KEY foreign_key_name (columns) REFERENCES parent_table(columns) ON DELETE action ON UPDATE action Let’s examine the syntax in greater detail: The CONSTRAINT clause allows you to define constraint name for the foreign key constraint. If you omit it, MySQL will generate ...