Mysql clone-tables
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This document discusses how to clone a MySQL table to create an exact copy that includes the same structure, indexes, and default values. It provides the following steps: 1) Use SHOW CREATE TABLE to get the CREATE TABLE statement for the source table 2) Modify the statement to change the table name and execute it to create the clone table 3) Optionally copy the table contents using INSERT INTO...SELECT to populate the clone table with the source data.
Mysql clone-tables
- 1. http://www.tutorialspoint.com/mysql/mysql-clone-tables.htm Copyright © tutorialspoint.com MYSQL CLONE TABLESMYSQL CLONE TABLES There may be a situation when you need an exact copy of a table and CREATE TABLE ... SELECT doesn't suit your purposes because the copy must include the same indexes, default values, and so forth. You can handle this situation by following steps: Use SHOW CREATE TABLE to get a CREATE TABLE statement that specifies the source table's structure, indexes and all. Modify the statement to change the table name to that of the clone table and execute the statement. This way, you will have exact clone table. Optionally, if you need the table contents copied as well, issue an INSERT INTO ... SELECT statement, too. Example: Try out the following example to create a clone table for tutorials_tbl. Step 1: Get complete structure about table. mysql> SHOW CREATE TABLE tutorials_tbl G; *************************** 1. row *************************** Table: tutorials_tbl Create Table: CREATE TABLE `tutorials_tbl` ( `tutorial_id` int(11) NOT NULL auto_increment, `tutorial_title` varchar(100) NOT NULL default '', `tutorial_author` varchar(40) NOT NULL default '', `submission_date` date default NULL, PRIMARY KEY (`tutorial_id`), UNIQUE KEY `AUTHOR_INDEX` (`tutorial_author`) ) TYPE=MyISAM 1 row in set (0.00 sec) ERROR: No query specified Step 2: Rename this table and create another table. mysql> CREATE TABLE `clone_tbl` ( -> `tutorial_id` int(11) NOT NULL auto_increment, -> `tutorial_title` varchar(100) NOT NULL default '', -> `tutorial_author` varchar(40) NOT NULL default '', -> `submission_date` date default NULL, -> PRIMARY KEY (`tutorial_id`), -> UNIQUE KEY `AUTHOR_INDEX` (`tutorial_author`) -> ) TYPE=MyISAM; Query OK, 0 rows affected (1.80 sec) Step 3: After executing step 2, you will create a clone table in your database. If you want to copy data from old table then you can do it by using INSERT INTO... SELECT statement. mysql> INSERT INTO clone_tbl (tutorial_id, -> tutorial_title,
- 2. -> tutorial_author, -> submission_date) -> SELECT tutorial_id,tutorial_title, -> tutorial_author,submission_date, -> FROM tutorials_tbl; Query OK, 3 rows affected (0.07 sec) Records: 3 Duplicates: 0 Warnings: 0 Finally, you will have exact clone table as you wanted to have.