mysql sql 兩張表之間完全復制的sql語句

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

,生成的bak 表沒有主鍵及索引的,用到的時候一點要注意.可以先建一個和要備份的表結構一

樣的表back_name,用以下方法倒入數據

insert into bak_table select * from original_name 這個方法

在mysql教程中可以把已經存在的表直接通過命令復制為另一個表

方法1：create table mmm select * from bbb; 注意：這條命令要求mmm這個表在數據庫教程中

不存在
這條命令可以創建新表mmm並且bbb中的表結構以及數據和mmm完全一樣，也可以導出部分字段

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

方法2：insert into mmm select * bbb; 這條語句和上一條語句實現同樣的功能，只是要求

mmm表必須在數據庫中存在

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)