复制表的几种方式
只复制表结构：只复制表结构，包括主键、索引，但不会复制表数据
create table tableName like someTable;
只关注表数据： 复制表的大体结构及全部数据，不会复制主键、索引等
create table tableName select * from someTable;
完整复制（表结构+数据）：分两步完成，先复制表结构，再插入数据。
create table tableName like someTable;
insert into tableName select * from someTable;
实战案例
创建表数据
create table t1(
id int not null auto_increment primary key,
name varchar(50)
);
insert into t1(name) values('zhangsan');
insert into t1(name) values('lisi');
create index idx_name on t1(name);
查看表数据
mysql> select * from t1;
+----+----------+
| id | name |
+----+----------+
| 2 | lisi |
| 1 | zhangsan |
+----+----------+
2 rows in set (0.00 sec)
mysql> show index from t1;
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| t1 | 0 | PRIMARY | 1 | id | A | 2 | NULL | NULL | | BTREE | | | YES | NULL |
| t1 | 1 | idx_name | 1 | name | A | 2 | NULL | NULL | YES | BTREE | | | YES | NULL |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
2 rows in set (0.01 sec)
只复制表结构
mysql> create table t2 like t1;
Query OK, 0 rows affected (0.05 sec)
mysql> select * from t2;
Empty set (0.00 sec)
mysql> show index from t2;
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| t2 | 0 | PRIMARY | 1 | id | A | 0 | NULL | NULL | | BTREE | | | YES | NULL |
| t2 | 1 | idx_name | 1 | name | A | 0 | NULL | NULL | YES | BTREE | | | YES | NULL |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
2 rows in set (0.01 sec)
mysql> show create table t2;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t2 | CREATE TABLE `t2` (
`id` int NOT NULL AUTO_INCREMENT,
`name` varchar(50) COLLATE utf8_bin DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `idx_name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
mysql>
只复制数据
mysql> create table t3 select * from t1;
Query OK, 2 rows affected (0.04 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from t3;
+----+----------+
| id | name |
+----+----------+
| 2 | lisi |
| 1 | zhangsan |
+----+----------+
2 rows in set (0.00 sec)
mysql> show create table t3;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t3 | CREATE TABLE `t3` (
`id` int NOT NULL DEFAULT '0',
`name` varchar(50) COLLATE utf8_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show index from t3;
Empty set (0.00 sec)
mysql>
完整复制
mysql> create table t4 like t1;
Query OK, 0 rows affected (0.04 sec)
mysql> insert into t4 select * from t1;
Query OK, 2 rows affected (0.02 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from t4;
+----+----------+
| id | name |
+----+----------+
| 2 | lisi |
| 1 | zhangsan |
+----+----------+
2 rows in set (0.00 sec)
mysql> show create table t4;
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t4 | CREATE TABLE `t4` (
`id` int NOT NULL AUTO_INCREMENT,
`name` varchar(50) COLLATE utf8_bin DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `idx_name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COLLATE=utf8_bin |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show index from t4;
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
| t4 | 0 | PRIMARY | 1 | id | A | 2 | NULL | NULL | | BTREE | | | YES | NULL |
| t4 | 1 | idx_name | 1 | name | A | 2 | NULL | NULL | YES | BTREE | | | YES | NULL |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+
2 rows in set (0.01 sec)
mysql>
