如何複製/複製表及其資料、觸發器和索引？

為了建立一個像舊表一樣的新表及其資料、觸發器和索引，我們需要執行以下兩個查詢

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

範例

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)

下面的查詢將建立與表employee 具有相似結構的表employee1。可以透過執行 DESCRIBE 查詢來檢查它。

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)

現在下面的查詢將在employee1中插入與employee中相同的值，可以如下檢查

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)

透過這種方式，我們也可以克隆表及其資料、觸發器和索引。

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