Question

我有这张表：

报价

+---------------------+-----------------------+------+-----+---------+---+
| Field               | Type                  | Null | Key | Default 
+---------------------+-----------------------+------+-----+---------+---+
| id                  | int(11) unsigned      | NO   | PRI | NULL    
... (More Columns)           
+---------------------+-----------------------+------+-----+-------------+

quotesPackagesInfo

+---------------+---------------------+------+-----+---------+------------+
| Field         | Type                | Null | Key | Default          
+---------------+---------------------+------+-----+---------+------------+
| id            | int(11) unsigned    | NO   | PRI | NULL     
| quoteId       | int(11) unsigned    | NO   |     | NULL    
... (More Columns)
+---------------+---------------------+------+-----+---------+------------+

quotesFlightsInfo

+---------------------------+---------------------+------+-----+----------+
| Field                     | Type                | Null | Key | Default 
+---------------------------+---------------------+------+-----+----------+
| id                        | int(11) unsigned    | NO   | PRI | NULL    
| quoteId                   | int(11) unsigned    | NO   | MUL | NULL                    
| packageId                 | int(11) unsigned    | YES  | MUL | NULL                                    ... (More Columns) 
+---------------------------+---------------------+------+-----+----------+

所以基本上有报价是主要的关键，在报价中有包裹后，包裹可以包含航班，所以我需要在删除包裹时，所有相关的航班都会被删除，所以我在航班上添加了一个外键，如下所示：

ALTER TABLE quotesFlightsInfo
ADD CONSTRAINT fk_quotesFlightsInfo_packageId
FOREIGN KEY (packageId) REFERENCES quotesPackagesInfo(id)
ON DELETE CASCADE

现在我试图向包中添加一个外键，所以当一个报价被删除时，包也会删除，所以航班但不起作用:(，这里是查询：

ALTER TABLE quotesPackagesInfo 
ADD CONSTRAINT fk_quotesPackagesInfo_quoteId 
FOREIGN KEY (quoteId) REFERENCES quotes(id) 
ON DELETE CASCADE

错误：无法添加或更新子行：外键约束失败（??????????。#sql-312_2，CONSTRAINT fk_quotesPackagesInfo_quoteId FOREIGN KEY（quoteId）REFERENCES {{1 } {（quotes）ON DELETE CASCADE）

Answer 1

我删除了quotesPackagesInfo表并再次创建它从开始添加外键并且它工作，但仍然不知道什么是错误的

在外键约束表中添加外键

1 个答案: