mysql报ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must

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mysql在建表时报故障ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key

  create table ll(
    -> id int(5) not null auto_increment,
    -> name varchar(10),
    -> age int(10));
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key

原因：在设置了自增长列以后需要定义主键列，否则报错

添加主键，修改后成功：

 create table ll(
    -> id int(5) not null auto_increment,
    -> name varchar(10),
    -> primary key(id));
Query OK, 0 rows affected (0.81 sec)