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-- id是需要删除的文章的id
DELETE m FROM message AS m
INNER JOIN user USING(id)
WHERE m.id = 100




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[/quote]
删除的时候你传入了留言的id 其实你表里面应该存入用户的id
删除:DELETE FROM table WHERE id = $id AND username = $_SESSION['username']
如果换用户id:DELETE FROM table WHERE id = $id AND user_id = $_SESSION['uid']

