how to use timestamp data type in more than two columns in mysql

If you use phpmyadmin and want to have two columns that hold timestamp fields, it will give you an error. We can't add more then one field as timestamp value.
Sometime, we have created_at and updated_at fields which might be timestamp column. To add these two columns as timestamp, we have alter table structure and run the following sql command:

ALTER TABLE customer_info CHANGE created_at created_at TIMESTAMP NOT NULL DEFAULT 0,
CHANGE  `updated_at`  `updated_at` TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL;

At first, we set the default value of the first timestamp column as zero and set the current timestamp on second timestamp column.

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