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)

AmitDiwan

Published on 22-Aug-2019 12:04:06

• Related Questions & Answers
• What is the purpose of the command interpreter?
• How to change the Title of the console using PowerShell command?
• How to change PowerShell ISE font Size using command?
• How to change the color of the PowerShell ISE editor using command?
• Does MongoDB getUsers() and SHOW command fulfil the same purpose?
• What is the purpose of MySQL TRIM() function?
• Change command Method for Tkinter Button in Python
• How to change the order of plots in Pandas hist command?
• Rename a table in MySQL using RENAME TABLE command
• Connecting to the MySQL Server Using Command Options
• Using Options on the Command Line for MySQL programs?
• What is the purpose of using MySQL CHAR_LENGTH() function? Which function is the synonym of it?
• What is the purpose of using JLink in Java 9?
• What is the purpose of ORDER BY columnname*1 in MySQL?
• Getting MySQL path in command prompt