mysql里面如何交换两列(包括列头在内)?

如果只是结果集中交换两列：

select name,id from 表名

如果更改表结构：

alter table 表名 modify column id int auto_increment after name

比如：

#建立测试表 t1

mysql>create table t1(id int auto_increment,name varchar(20),primary key(id))engine=innodb,default charset=utf8

Query OK, 0 rows affected (0.11 sec)

#插入3条数据

mysql>insert into t1(name) values ("aa"),("bb"),("cc")

Query OK, 3 rows affected (0.00 sec)

Records: 3 Duplicates: 0 Warnings: 0

mysql>select * from t1

+----+------+

| id | name |

+----+------+

| 1 | aa |

| 2 | bb |

| 3 | cc |

+----+------+

3 rows in set (0.00 sec)

#结果集中排列name到id前

mysql>select name,id from t1

+------+----+

| name | id |

+------+----+

| aa | 1 |

| bb | 2 |

| cc | 3 |

+------+----+

3 rows in set (0.00 sec)

#改变表结构，使name在id前

mysql>alter table t1 modify column id int auto_increment after name

Query OK, 3 rows affected (0.19 sec)

Records: 3 Duplicates: 0 Warnings: 0

mysql>select * from t1

+------+----+

| name | id |

+------+----+

| aa | 1 |

| bb | 2 |

| cc | 3 |

+------+----+

3 rows in set (0.00 sec)

mysql>desc t1

+-------+-------------+------+-----+---------+----------------+

| Field | Type| Null | Key | Default | Extra |

+-------+-------------+------+-----+---------+----------------+

| name | varchar(20) | YES | | NULL||

| id| int(11) | NO | PRI | NULL| auto_increment |

+-------+-------------+------+-----+---------+----------------+

1. 表结构完全一样

insert into 表1

select * from 表2

2. 表结构不一样（这种情况下得指定列名）

insert into 表1 (列名1,列名2,列名3)

select 列1,列2,列3 from 表2

---