How to alter a MySQL column to be AUTO INCREMENT

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I’m trying to modify a table to make its primary key column AUTO_INCREMENT after the fact. I have tried the following SQL, but got a syntax error notification.

ALTER TABLE document
ALTER COLUMN document_id AUTO_INCREMENT

Am I doing something wrong or is this not possible?

Aug 19, 2020 in PHP by kartik
• 37,530 points
114 views

1 answer to this question.

0 votes

Hello @kartik,

Try this:

ALTER TABLE document MODIFY COLUMN document_id INT auto_increment

Hope it helps!!
Thank you!

answered Aug 19, 2020 by Niroj
• 82,780 points

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