SQL statements about issues, a post, many comments below

SQL statement issues, a post, a lot of comments below
SQL statement issues, a post, a lot of comments below. With join query, the following comments only one, the other is not found out, how to write it?
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Paste out your table structure and look at the SQL.
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SELECT * from comment table where RID = The post ID you viewed;
Do not understand where to use the join?

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There is no need to join.
SELECT * FROM table where rid= post ID;
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By the ID to drop the data can not involve the other unless you need to call the user information, it is possible, otherwise just read the post reply is not necessary to do join.

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