How to add columns to an existing MySQL table?

By using ALTER command we can add columns to an existing table.

Syntax

Alter table table-name ADD (column-name datatype);

Example

 In the example below, with the help of ALTER Command, column ‘GRADE’ is added to the table ‘Student’.

mysql> Alter table Student ADD (Grade Varchar(10));
Query OK, 5 rows affected (1.05 sec)
Records: 5 Duplicates: 0 Warnings: 0