Friend of a friend in PHP/MySQL?

Question

I have a social network similar to myspace/facebook. In my code you are either a person\'s friend or not a friend, so I show all actions from people you are friends with (in

Answer 1

This should pull out all the user's friend's posts.

SELECT * FROM posts WHERE uid IN (SELECT friend_uid FROM friends WHERE uid=1) ORDER BY post_id DESC

This should pull out all posts that are your friend's friend's.

SELECT * FROM posts WHERE uid IN (SELECT friend_uid FROM friends WHERE uid IN (SELECT friend_uid FROM friends WHERE uid=1)) ORDER BY post_id DESC