mysql update auto_increment value code example

Example 1: mysql alter column auto increment

ALTER TABLE document MODIFY COLUMN document_id INT auto_increment

Example 2: alter table auto_increment

ALTER TABLE ALLITEMS CHANGE itemid itemid INT(10)AUTO_INCREMENT PRIMARY KEY;

Example 3: mysql reset auto increment to 1

ALTER TABLE tablename AUTO_INCREMENT = 1

Example 4: mysql add auto increment id existing table

ALTER TABLE `users` ADD `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY