mysql alter table add auto_increment primary key code example
Example 1: mysql alter column auto increment
ALTER TABLE document MODIFY COLUMN document_id INT auto_increment
Example 2: how to change the auto increment in existing table mysql
ALTER TABLE tbl_access ADD COLUMN `access_id` int(10) NOT NULL PRIMARY KEY AUTO_INCREMENT FIRST
Example 3: mysql add auto increment id existing table
ALTER TABLE `users` ADD `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY