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)