mysql sql 两张表之间完全复制的sql语句

在MySql4.0.12中,用" create table bak_name as select * from original_name"语句后

,生成的bak 表没有主键及索引的,用到的时候一点要注意.可以先建一个和要备份的表结构一

样的表back_name,用以下方法倒入数据

insert into bak_table select * from original_name 这个方法

在mysql教程中可以把已经存在的表直接通过命令复制为另一个表

方法1：create table mmm select * from bbb; 注意：这条命令要求mmm这个表在数据库教程中

不存在
这条命令可以创建新表mmm并且bbb中的表结构以及数据和mmm完全一样，也可以导出部分字段

create table mmm select 字段1,字段2 from bbb;

方法2：insert into mmm select * bbb; 这条语句和上一条语句实现同样的功能，只是要求

mmm表必须在数据库中存在

mysql>
mysql> CREATE TABLE Topic(
    ->    TopicID     SMALLINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    ->    Name        VARCHAR(50) NOT NULL,
    ->    InStock     SMALLINT UNSIGNED NOT NULL,
    ->    OnOrder     SMALLINT UNSIGNED NOT NULL,
    ->    Reserved    SMALLINT UNSIGNED NOT NULL,
    ->    Department ENUM('Classical', 'Popular') NOT NULL,
    ->    Category    VARCHAR(20) NOT NULL,
    ->    RowUpdate   TIMESTAMP NOT NULL
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql>
mysql>
mysql> INSERT INTO Topic (Name,          InStock, OnOrder, Reserved, Department,

Category) VALUES
    ->                   ('Java',          10,      5,       3,        'Popular',

   'Rock'),
    ->                   ('JavaScript',    10,      5,       3,

'Classical', 'Opera'),
    ->                   ('C Sharp',       17,      4,       1,        'Popular',

   'Jazz'),
    ->                   ('C',             9,       4,       2,

'Classical', 'Dance'),
    ->                   ('C++',           24,      2,       5,

'Classical', 'General'),
    ->                   ('Perl',          16,      6,       8,

'Classical', 'Vocal'),
    ->                   ('Python',        2,       25,      6,        'Popular',

   'Blues'),
    ->                   ('Php',           32,      3,       10,       'Popular',

   'Jazz'),
    ->                   ('ASP.net',       12,      15,      13,       'Popular',

   'Country'),
    ->                   ('VB.net',        5,       20,      10,       'Popular',

   'New Age'),
    ->                   ('VC.net',        24,      11,      14,       'Popular',

   'New Age'),
    ->                   ('UML',           42,      17,      17,

'Classical', 'General'),
    ->                   ('www.java2s.com',25,      44,      28,

'Classical', 'Dance'),
    ->                   ('Oracle',        32,      15,      12,

'Classical', 'General'),
    ->                   ('Pl/SQL',        20,      10,      5,

'Classical', 'Opera'),
    ->                   ('Sql Server',    23,      12,      8,

'Classical', 'General');
Query OK, 16 rows affected (0.00 sec)
Records: 16 Duplicates: 0 Warnings: 0

mysql>
mysql> select * from Topic;
+---------+----------------+---------+---------+----------+------------+--------

--+---------------------+
| TopicID | Name           | InStock | OnOrder | Reserved | Department | Category

| RowUpdate           |
+---------+----------------+---------+---------+----------+------------+--------

--+---------------------+
|       1 | Java           |      10 |       5 |        3 | Popular    | Rock

| 2007-07-23 19:09:52 |
|       2 | JavaScript     |      10 |       5 |        3 | Classical | Opera

| 2007-07-23 19:09:52 |
|       3 | C Sharp        |      17 |       4 |        1 | Popular    | Jazz

| 2007-07-23 19:09:52 |
|       4 | C              |       9 |       4 |        2 | Classical | Dance

| 2007-07-23 19:09:52 |
|       5 | C++            |      24 |       2 |        5 | Classical | General

| 2007-07-23 19:09:52 |
|       6 | Perl           |      16 |       6 |        8 | Classical | Vocal

| 2007-07-23 19:09:52 |
|       7 | Python         |       2 |      25 |        6 | Popular    | Blues

| 2007-07-23 19:09:52 |
|       8 | Php            |      32 |       3 |       10 | Popular    | Jazz

| 2007-07-23 19:09:52 |
|       9 | ASP.net        |      12 |      15 |       13 | Popular    | Country

| 2007-07-23 19:09:52 |
|      10 | VB.net         |       5 |      20 |       10 | Popular    | New Age

| 2007-07-23 19:09:52 |
|      11 | VC.net         |      24 |      11 |       14 | Popular    | New Age

| 2007-07-23 19:09:52 |
|      12 | UML            |      42 |      17 |       17 | Classical | General

| 2007-07-23 19:09:52 |
|      13 | www.java2s.com |      25 |      44 |       28 | Classical | Dance

| 2007-07-23 19:09:52 |
|      14 | Oracle         |      32 |      15 |       12 | Classical | General

| 2007-07-23 19:09:52 |
|      15 | Pl/SQL         |      20 |      10 |        5 | Classical | Opera

| 2007-07-23 19:09:52 |
|      16 | Sql Server     |      23 |      12 |        8 | Classical | General

| 2007-07-23 19:09:52 |
+---------+----------------+---------+---------+----------+------------+--------

--+---------------------+
16 rows in set (0.00 sec)

mysql>
mysql> CREATE TABLE Topic2
    -> (
    ->    TopicID SMALLINT NOT NULL PRIMARY KEY,
    ->    Name VARCHAR(50) NOT NULL,
    ->    InStock SMALLINT UNSIGNED NOT NULL
    -> )
    -> SELECT TopicID, Name, InStock
    -> FROM Topic
    -> WHERE Category='Blues' OR Category='Jazz';
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql>
mysql> select * from Topic2;
+---------+---------+---------+
| TopicID | Name    | InStock |
+---------+---------+---------+
|       3 | C Sharp |      17 |
|       7 | Python |       2 |
|       8 | Php     |      32 |
+---------+---------+---------+
3 rows in set (0.00 sec)

补充：数据库,mysql教程