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例子1 复制完全相同的记录(条件是表结构中没有auto_increment,和uniq字段)
mysql> select * from president;
+------------+---------------+--------+---------------------+-------+------------+------------+
| last_name  | first_name    | suffix | city                | state | birth      | death      |
+------------+---------------+--------+---------------------+-------+------------+------------+
| Washington | George        | NULL   | Wakefield           | VA    | 1732-02-22 | 1799-12-14 |
| Adams      | John          | NULL   | Braintree           | MA    | 1735-10-30 | 1826-07-04 |
| Jefferson  | Thomas        | NULL   | Albemarle County    | VA    | 1743-04-13 | 1826-07-04 |
| Madison    | James         | NULL   | Port Conway         | VA    | 1751-03-16 | 1836-06-28 |

mysql> desc president;
+------------+-------------+------+-----+---------+-------+
| Field      | Type        | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+-------+
| last_name  | varchar(15) | NO   | MUL | NULL    |       |
| first_name | varchar(15) | NO   |     | NULL    |       |
| suffix     | varchar(5)  | YES  |     | NULL    |       |
| city       | varchar(20) | NO   |     | NULL    |       |
| state      | varchar(2)  | NO   |     | NULL    |       |
| birth      | date        | NO   |     | NULL    |       |
| death      | date        | YES  |     | NULL    |       |
+------------+-------------+------+-----+---------+-------+

在这种情况下要在表中复制一条Washington  George 的记录,输入以下命令即可:
mysql> insert into president select * from president where last_name='Washington';



例子2:新增部分字段相同的记录
mysql> select * from manager;
+----+-------------+-------+-------------+----------+------------+---------------------+
| id | enable_flag | types | account     | password | location   | reg_date            |
+----+-------------+-------+-------------+----------+------------+---------------------+
|  1 |           1 |     1 | abcd        | 1234567  |            | 0000-00-00 00:00:00 |
| 13 |           1 |     2 | anonymous   | 654123   | 0100000000 | 2003-06-30 17:29:04 | 


其表结构如下:
mysql> desc manager;
+-------------+-------------+------+-----+---------------------+----------------+
| Field       | Type        | Null | Key | Default             | Extra          |
+-------------+-------------+------+-----+---------------------+----------------+
| id          | int(4)      | NO   | PRI | NULL                | auto_increment |
| enable_flag | smallint(2) | NO   |     | 0                   |                |
| types       | smallint(2) | NO   |     | 0                   |                |
| account     | varchar(50) | NO   | UNI |                     |                |
| password    | varchar(50) | NO   |     |                     |                |
| location    | varchar(10) | NO   |     |                     |                |
| reg_date    | datetime    | NO   |     | 0000-00-00 00:00:00 |                |
 ------------+-------------+------+-----+---------------------+----------------+

若想通过新增一条和manager 表中的anonymous这条记录,其它字段内容相同,但名字不同的记录(account为test)。则得用以下方法:
因为manager表的 id字段是auto_increment,而且account字段是具有唯一性的(UNI).所以我们得具体指定这两个字段的值。
mysql>  insert into manager select '22',enable_flag,types,'test',password, location,reg_date from manager where account='anonymous';