mysql Selecting from two different tables.

Question

$sql = \"select body, stamp from posts where user_id = \'$userid\' order by stamp desc\";

NOTE: the above query works fine. What I want to do is also s

Answer 1

 select body, stamp, username 
    from posts,users 
    where users.user_id = post.user_id 
        and users.user_id = '$userid' 
    order by stamp desc;