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-- 实训任务新增“参考答案”资料位（教师端/平台管理端实训任务管理上传）。
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-- 后端 TrainingTaskServiceImpl 启动时会自动补列（ensureReferenceAnswerColumns），
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-- 本脚本供手工执行或核对用，重复执行前请先确认列不存在。
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ALTER TABLE training_task
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ADD COLUMN reference_answer_name varchar(255) NULL AFTER ai_manual_url,
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ADD COLUMN reference_answer_url varchar(500) NULL AFTER reference_answer_name;
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ALTER TABLE training_task_class_config
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ADD COLUMN reference_answer_name varchar(255) NULL AFTER ai_manual_url,
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ADD COLUMN reference_answer_url varchar(500) NULL AFTER reference_answer_name;
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