rails db:migrateでalready existsというエラーの対処方法 - Qiita

-------------------------------------------------------------------------- rails aborted! StandardError: An error has occurred, all later migrations canceled: Mysql2::Error: Table 'notifications' already exists: CREATE TABLE `notifications` (`id` bigint NOT NULL AUTO_INCREMENT PRIMARY KEY, `visiter_id` int NOT NULL, `visited_id` int NOT NULL, `post_id` int, `comment_id` int, `action` varchar(255)