當我嘗試在數據庫中,我得到以下錯誤插入:錯誤在MySQL(約束)將
DBD::mysql::st execute failed: Cannot add or update a child row: a foreign key constraint fails (`vym`.`vendedor`, CONSTRAINT `fk_vendedor_division` FOREIGN KEY (`codigo_empresa`, `codigo_division`) REFERENCES `division` (`codigo_empresa`, `codigo`)) at vendedores_aes_insert_85 line 53
我知道我有一個約束,但我不知道如何解釋該消息。什麼是約束,爲什麼?
[約束](http://www.w3resource.com/mysql/creating-table-advance/constraint.php) – 2013-03-11 14:52:48