准备表

MariaDB [test]> create table user(

-> id int primary key,

-> name varchar(20));

Query OK, 0 rows affected (0.04 sec)

MariaDB [test]> insert into user values

-> (1,'jim'),

-> (2,'tom'),

-> (1000,'jack');

Query OK, 3 rows affected (0.02 sec)

Records: 3 Duplicates: 0 Warnings: 0

1、复制记录

要求：有两张表，但是字段数不同

复制全部记录

MariaDB [test]> create table user1

-> (id int,

-> name varchar(20),

-> tel char(11));

Query OK, 0 rows affected (0.04 sec)

MariaDB [test]> insert into user1(id,name) select * from user;

Query OK, 3 rows affected (0.02 sec)

Records: 3 Duplicates: 0 Warnings: 0

复制一部分记录

MariaDB [test]> create table user2 (id int, name varchar(20), info char(11));

Query OK, 0 rows affected (0.04 sec)

MariaDB [test]> insert into user2(id,name) select * from user where id<1000;

Query OK, 2 rows affected (0.01 sec)

Records: 2 Duplicates: 0 Warnings: 0

2、复制表

可以表结构、也可以结构和内容一起复制

复制表提供一张源表

1)全表复制(复制表结构和内容，但是不复制主键、外键、索引)

MariaDB [test]> create table user3 select * from user;

Query OK, 3 rows affected (0.05 sec)

Records: 3 Duplicates: 0 Warnings: 0

MariaDB [test]> select * from user3;

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

| id | name |

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

| 1 | jim |

| 2 | tom |

| 1000 | jack |

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

3 rows in set (0.00 sec)

MariaDB [test]> desc user3;

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

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

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

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

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

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

2 rows in set (0.00 sec)

2)复制表的一部分

MariaDB [test]> create table user4 select name from user;

Query OK, 3 rows affected (0.04 sec)

Records: 3 Duplicates: 0 Warnings: 0

MariaDB [test]> select * from user4;

+------+

| name |

+------+

| jim |

| tom |

| jack |

+------+

3 rows in set (0.00 sec)

3)只复制表结构

方法一：不复制主键、外键、索引

MariaDB [test]> create table user5 select * from user where 1<0;

Query OK, 0 rows affected (0.04 sec)

Records: 0 Duplicates: 0 Warnings: 0

MariaDB [test]> select * from user5;

Empty set (0.00 sec)

MariaDB [test]> desc user5;

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

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

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

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

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

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

2 rows in set (0.00 sec)

方法二：完全复制

MariaDB [test]> create table user6 like user;

Query OK, 0 rows affected (0.04 sec)

MariaDB [test]> select * from user6;

Empty set (0.00 sec)

MariaDB [test]> desc user6;

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

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

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

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

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

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

2 rows in set (0.00 sec)