介绍一下什么意思
ALTER TABLE `owned_vehicles` ADD `insurance` VARCHAR(100) NOT NULL DEFAULT 'none' AFTER `state`,ADD `cooldown` INT NOT NULL DEFAULT '0' AFTER `insurance`;
MySQL 返回: [color=var(--bs-link-color)][url=http://localhost/phpmyadmin/url.php?url=https%3A%2F%2Fdev.mysql.com%2Fdoc%2Frefman%2F8.0%2Fen%2Fserver-error-reference.html][/url] #1054 - 未知列'state'在'owned_vehicles'
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