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所以我有3个表：共享主键的多个表
口袋妖怪：
+---------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+---------+-------+
| National_ID | int(11) | NO | PRI | NULL | |
| Picture | longblob | YES | | NULL | |
| Name | varchar(15) | NO | | NULL | |
| Generation_ID | int(11) | NO | | NULL | |
| Type1 | varchar(8) | NO | | NULL | |
| Type2 | varchar(8) | YES | | NULL | |
+---------------+-------------+------+-----+---------+-------+
统计：
+-----------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+-------------+------+-----+---------+-------+
| National_ID | int(11) | NO | PRI | NULL | |
| Health_Points | int(11) | NO | | NULL | |
| Attack | int(11) | NO | | NULL | |
| Defense | int(11) | NO | | NULL | |
| Special_Attack | int(11) | NO | | NULL | |
| Special_Defense | int(11) | NO | | NULL | |
| Speed | int(11) | NO | | NULL | |
| Ability1 | varchar(20) | NO | | NULL | |
| Ability2 | varchar(20) | YES | | NULL | |
+-----------------+-------------+------+-----+---------+-------+
其他：
+--------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| National_ID | int(11) | NO | PRI | NULL | |
| Evolves_From | varchar(15) | YES | | NULL | |
| Species | varchar(20) | NO | | NULL | |
| Height_inch | int(11) | NO | | NULL | |
| Weight_lbs | int(11) | NO | | NULL | |
| Capture_Rate | int(11) | NO | | NULL | |
+--------------+-------------+------+-----+---------+-------+
我的问题是， Stats表中的National_ID指向th e口袋妖怪表中的National_ID，但我无法对杂项表做同样的处理。
每当我尝试在Misc中添加一个外键指向口袋妖怪表时，我得到一个重复错误。请帮助！谢谢
杂项表是否有任何外键约束？ –
不，在此查询之后“ALTER TABLE Misc ADD CONSTRAINT FK_National_ID FOREIGN KEY（National_ID）REFERENCES Pokemon（National_ID）;”我会收到重复错误。 –
请指定您希望表格如何相互关联。忘记“外键”等等。只是解释你希望表格如何相互关联。使用当前列将是有用的 –