App Friends
Problem
I need to find all of the friends of a specific user who have already installed my application.
Solution
SELECT uid FROM user WHERE has_added_app = 1 AND uid IN (SELECT uid2 FROM friend WHERE uid1 = $user);
Discussion
This particularly comes in handy when you’re displaying an
fb:multi-friend-selector
control in FBML and want to exclude friends of the current loggedinuser who have already installed your
app (see Invitations and Requests).
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