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mysql高效查询评论及回复内容,并且分页,如何查?

已有评论表结构:
id,parentid,content,ctime

id是评论id,parentid是父级评论id,也就是被回复的评论id,parentid不为空时,表示这是一条回复评论。

如何通过这张表,高效的查询出评论及其回复的评论,并且分页。回复评论会有多层。

各位sql大神,显示一下身手,我自己写的效率太低,分页还会混乱。


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