Change the column name from StudentName to FirstName in MySQL?

Use CHANGE with ALTER statement. Let us first create a table −

mysql> create table DemoTable
-> (
-> StudentName varchar(100),
-> Age int
-> );
Query OK, 0 rows affected (0.84 sec)

Now check the description of table −

mysql> desc DemoTable;

This will produce the following output −

+----------------+--------------+------+-----+---------+-------+
| Field          | Type         | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+-------+
| StudentName    | varchar(100) | YES  |     | NULL    |       |
| Age            | int(11)      | YES  |     | NULL    |       |
+----------------+--------------+------+-----+---------+-------+
2 rows in set (0.25 sec)

Here is the query with ALTER −

mysql> alter table DemoTable
   -> add column Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> add column CountryName varchar(100) after Age,
   -> change column StudentName FirstName varchar(200);
Query OK, 0 rows affected (1.51 sec)
Records: 0 Duplicates: 0 Warnings: 0

Now check the description of table once again −

mysql> desc DemoTable;

This will produce the following output −

+-------------+--------------+------+-----+---------+----------------+
| Field       | Type         | Null | Key | Default | Extra          |
+-------------+--------------+------+-----+---------+----------------+
| FirstName   | varchar(200) | YES  |     | NULL    |                |
| Age         | int(11)      | YES  |     | NULL    |                |
| CountryName | varchar(100) | YES  |     | NULL    |                |
| Id          | int(11)      | NO   | PRI | NULL    | auto_increment |
+-------------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

Karthikeya Boyini

Published on 12-Jul-2019 11:10:33