如何克隆/复制表及其数据、触发器和索引？

为了创建一个像旧表一样的新表及其数据、触发器和索引，我们需要运行以下两个查询

CREATE TABLE new_table LIKE old_table;
INSERT new_table SELECT * from old_table;

示例

mysql> Create table employee(ID INT PRIMARY KEY NOT NULL AUTO_INCREMENT, NAME VARCHAR(20));
Query OK, 0 rows affected (0.21 sec)

mysql> Describe employee;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| ID    | int(11)     | NO   | PRI | NULL    | auto_increment |
| NAME  | varchar(20) | YES  |     | NULL    |                |
+-------+-------------+------+-----+---------+----------------+
2 rows in set (0.07 sec)

mysql> Insert into employee(name) values('Gaurav'),('Raman');
Query OK, 2 rows affected (0.07 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> Select * from employee;
+----+--------+
| ID | NAME   |
+----+--------+
| 1  | Gaurav |
| 2  | Raman  |
+----+--------+
2 rows in set (0.00 sec)

下面的查询将创建与表employee 具有相似结构的表employee1。可以通过运行 DESCRIBE 查询来检查它。

mysql> create table employee1 like employee;
Query OK, 0 rows affected (0.19 sec)

mysql> describe employee1;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| ID    | int(11)     | NO   | PRI | NULL    | auto_increment |
| NAME  | varchar(20) | YES  |     | NULL    |                |
+-------+-------------+------+-----+---------+----------------+
2 rows in set (0.14 sec)

现在下面的查询将在employee1中插入与employee中相同的值，可以按如下方式检查

mysql> INSERT INTO employee1 select * from employee;
Query OK, 2 rows affected (0.09 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> select * from employee1;
+----+--------+
| ID | NAME   |
+----+--------+
| 1  | Gaurav |
| 2  | Raman  |
+----+--------+
2 rows in set (0.00 sec)

通过这种方式，我们也可以克隆表及其数据、触发器和索引。

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