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)
Published on 22-Aug-2019 15:34:06
