根据上述需求，评论表至少需要如下字段： root_id字段记录根评论id，顶级评论则为空，从而更方便的查询其子评论。 reply_id字段记录父评论id，顶级评论则为空，从而方便查询其回复了哪个用户。 问：为什么不直接记录回复的用户id？ 答：这样做可以更方便的 ...

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