将 MySQL 列更改为 AUTO_INCREMENT

我正在尝试修改一个表以使其主键列 AUTO_INCREMENT 事后.我尝试了以下 SQL，但收到了语法错误通知.

ALTER TABLE 文档ALTER COLUMN document_id AUTO_INCREMENT

我做错了什么还是不可能?

<前>+--------------------+|版本() |+--------------------+|5.0.75-0ubuntu10.2 |+--------------------+

解决方案

ALTER TABLE document MODIFY COLUMN document_id INT auto_increment

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?

+--------------------+
| VERSION()          |
+--------------------+
| 5.0.75-0ubuntu10.2 |
+--------------------+

解决方案

ALTER TABLE document MODIFY COLUMN document_id INT auto_increment