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Purpose of using CHANGE command in MySQL?
The CHANGE command in MySQL is used to rename column name. Let us first create a table −
mysql> create table DemoTable796 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,Name varchar(100),StudentAge int ); Query OK, 0 rows affected (0.56 sec)
Let us check the description of table −
mysql> desc DemoTable796;
This will produce the following output −
+------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+----------------+ | StudentId | int(11) | NO | PRI | NULL | auto_increment | | Name | varchar(100) | YES | | NULL | | | StudentAge | int(11) | YES | | NULL | | +------------+--------------+------+-----+---------+----------------+ 3 rows in set (0.00 sec)
Following is the query to use CHANGE command in MySQL −
mysql> alter table DemoTable796 change Name StudentName varchar(100); Query OK, 0 rows affected (0.29 sec) Records: 0 Duplicates: 0 Warnings: 0
Let us check the description of table once again −
mysql> desc DemoTable796;
This will produce the following output −
+-------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------------+------+-----+---------+----------------+ | StudentId | int(11) | NO | PRI | NULL | auto_increment | | StudentName | varchar(100) | YES | | NULL | | | StudentAge | int(11) | YES | | NULL | | +-------------+--------------+------+-----+---------+----------------+ 3 rows in set (0.00 sec)
Updated on: 02-Jul-2020
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