我有以下表模式,它将 user_customers 映射到实时 MySQL 数据库的权限:
mysql> describe user_customer_permission;
+------------------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| user_customer_id | int(11) | NO | PRI | NULL | |
| permission_id | int(11) | NO | PRI | NULL | |
+------------------+---------+------+-----+---------+----------------+
3 rows in set (0.00 sec)
我想删除 user_customer_id 和 permission_id 的主键并保留 id 的主键。
当我运行命令时:
alter table user_customer_permission drop primary key;
我收到以下错误:
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key
如何删除列的主键?