mysql> create table orders2(id int auto_increment primary key, customer_id int, description varchar(50), constraint fk_orders foreign key (customer_id) references customer(id));
ERROR 1105 (HY000): Can't write; duplicate key in table 'orders2'

报错原因：
外键名称已经存在，更换一个外键名称
mysql> create table orders2(id int auto_increment primary key, customer_id int, description varchar(50), constraint fk_orders2 foreign key (customer_id) references customer2(id));
Query OK, 0 rows affected (0.22 sec)

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MySQL 创建外键报错Can't write; duplicate key in table

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