向MySQL表添加外键出错:错误1215(HY000):无法添加外键约束
当我尝试向表中添加外键约束时,有人能解释一下为什么MySQL会出错吗 这是我的桌子:向MySQL表添加外键出错:错误1215(HY000):无法添加外键约束,mysql,foreign-keys,Mysql,Foreign Keys,当我尝试向表中添加外键约束时,有人能解释一下为什么MySQL会出错吗 这是我的桌子: mysql> desc workflow_stakeholder_sectors; +----------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+------
mysql> desc workflow_stakeholder_sectors;
+----------------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| stakeholder_id | int(11) | NO | | NULL | |
| sector_id | int(11) | NO | | NULL | |
+----------------+---------+------+-----+---------+----------------+
3 rows in set (0.01 sec)
mysql> desc workflow_stakeholder;
+---------------------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(255) | YES | | NULL | |
| stakeholder_register | tinyint(1) | NO | | NULL | |
| create_date | datetime | YES | | NULL | |
| edit_date | datetime | YES | | NULL | |
| country_id | int(11) | NO | MUL | NULL | |
| formal_relationship_document_id | int(11) | YES | MUL | NULL | |
| sector_id | int(11) | YES | MUL | NULL | |
| type_id | int(11) | YES | MUL | NULL | |
| vetting_document_id | int(11) | YES | MUL | NULL | |
| approval | varchar(255) | YES | | NULL | |
| approved_by_id | int(11) | YES | MUL | NULL | |
| filled_by_id | int(11) | YES | MUL | NULL | |
+---------------------------------+--------------+------+-----+---------+----------------+
13 rows in set (0.00 sec)
我正在使用macOS Sierra版本10.12.4和mysql版本14.14发行版5.7.17,用于macos10.12(x86_64),使用EditLine包装器
我使用以下mysql语句添加外键:
ALTER TABLE `workflow_stakeholder_sectors` ADD CONSTRAINT
`workflow_stak_stakeholder_id_b87707c1_fk_workflow_stakeholder_id`
FOREIGN KEY (`stakeholder_id`) REFERENCES `workflow_stakeholder` (`id`);
我得到的错误是:
ERROR 1215 (HY000): Cannot add foreign key constraint
导致错误的可能原因有:
- 一个或两个表是MyISAM或其他存储引擎,而不是InnoDB
感谢您至少发布了表的
输出, 但是DESC
不显示存储引擎<代码>显示创建表显示 这些信息DESC
workflow\u涉众\u扇区中存在引用
中缺少的涉众id值的某些行。请尝试以下查询:workflow\u涉众
SELECT COUNT(*) FROM workflow_stakeholder_sectors wss LEFT OUTER JOIN workflow_stakeholder ws ON wss.stakeholder_id = ws.id WHERE ws.id IS NULL