Question

I have a query to get the users friends, and one to get all posts users have posted as statuses, now I need to combine them.

Friends:

SELECT CASE WHEN userID=$session THEN userID2 ELSE userID END AS friendID 
FROM friends 
WHERE userID=$session OR userID2=$session

then users posts:

SELECT * FROM posts 
WHERE toID=fromID AND state='0' 
ORDER BY id DESC LIMIT 10

so both work as they should work together. friendID from the first query should equal toID or fromID, it doesn’t matter which since they both need to be the same.

Answer 1

Your second condition for the posts is that they are from friends. So:

SELECT * FROM posts  
WHERE toID=fromID AND state='0' AND toID IN
    (SELECT CASE WHEN userID=$session THEN userID2 ELSE userID END AS friendID  
     FROM friends  
     WHERE userID=$session OR userID2=$session)
ORDER BY id DESC LIMIT 10