删除主键时,出错:[Err] 1075 - Incorrect table definition; there can be only one auto column and it must be defined as a key alter table table_name drop primary key; # [Err] 1075 这是因为,建表时,该主键设置的是自增属性:即AUTO_INCREMENT 而自增列只能有1列,且这列必须为key,也就是建表的时候,如果是自增列,必须用prim…