How do I make replies to comments? (PHP)

Posted by jpjp on Stack Overflow See other posts from Stack Overflow or by jpjp
Published on 2010-05-28T23:15:18Z Indexed on 2010/05/28 23:22 UTC
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php

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mysql

I want to create something like reddit where they have comments, then replies to the comment, then reply to the reply.

What type of database structure do they use so:

1. they keep track of all the comments to a posting
2. a reply to a comment
3. a reply to a reply

All I have right are is just a posting and a bunch of comments relating to it like..

POSTING TABLE
posting_id | title | author

COMMENTS TABLE
comment_id | posting_id | comment

REPLIES TABLE
????

How do I relate the comments to the replies? What type of css do they use to give replies that indented space?

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