Invalid SQL:
SELECT user.userid AS user_uid , user.teamid AS userteamid, user.lastpost AS userlastpost,
IF(votenum >= 1, votenum, 0) AS votenum,
IF(votenum >= 1 AND votenum > 0, votetotal / votenum, 0) AS voteavg,
post.pagetext AS preview,
thread.threadid, thread.title AS threadtitle, lastpost, thread.forumid, pollid, open, replycount, postusername, postuserid, thread.iconid AS threadiconid,
lastposter, thread.dateline, IF(views<=replycount, replycount+1, views) AS views, notes, thread.visible, sticky, votetotal, thread.attach
, NOT ISNULL(subscribethread.subscribethreadid) AS issubscribed
, NOT ISNULL(deletionlog.primaryid) AS isdeleted, deletionlog.userid AS del_userid, deletionlog.username AS del_username, deletionlog.reason AS del_reason
FROM thread AS thread
LEFT JOIN deletionlog AS deletionlog ON(thread.threadid = deletionlog.primaryid AND type = 'thread')
LEFT JOIN subscribethread AS subscribethread ON(subscribethread.threadid = thread.threadid AND subscribethread.userid = 1)
LEFT JOIN post AS post ON(post.postid = thread.firstpostid)
LEFT JOIN user AS user ON(user.userid = thread.postuserid)
WHERE thread.threadid IN (0,2,1)
ORDER BY sticky DESC, lastpost DESC
mysql error: Column: 'lastpost' in field list is ambiguous
same 1
You are using the column 'lastpost' more then once, so you should also change it more then once.