Need help with SQL statment

Code:

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SELECT u.username, u.user_id, u.user_posts, u.user_from, u.user_website, u.user_email, u.user_icq, u.user_aim, u.user_yim, u.user_regdate, u.user_msnm, u.user_viewemail, u.user_rank, u.user_sig, u.user_sig_bbcode_uid, u.user_avatar, u.user_avatar_type, u.user_allowavatar, u.user_allowsmile, p.*,  pt.post_text, pt.post_subject, pt.bbcode_uid
        FROM " . POSTS_TABLE . " p, " . USERS_TABLE . " u, " . POSTS_TEXT_TABLE . " pt
        WHERE p.topic_id = $topic_id
                $limit_posts_time
                AND pt.post_id = p.post_id
                AND u.user_id = p.poster_id
        ORDER BY p.post_time $post_time_order

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This is the current sql that I have, but I need to have it select:

Code:

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SELECT e.member_race_id, e.member_class_id
FROM eqdkp members
WHERE e.member_id = u.user_eqdkpmem

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but the only problem is, I want it to return null for e.member_race_id and e.member_class_id, if there is no match

I fixed it:

Code:

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SELECT u.username, u.user_id, u.user_posts, u.user_from, u.user_website, u.user_email, u.user_icq, u.user_aim, u.user_yim, u.user_regdate, u.user_msnm, u.user_viewemail, u.user_rank, u.user_eqdkpmem, u.user_sig, u.user_sig_bbcode_uid, u.user_avatar, u.user_avatar_type, u.user_allowavatar, u.user_allowsmile, p. * , pt.post_text, pt.post_subject, pt.bbcode_uid, j.member_id
FROM `phpbb_posts` p, `phpbb_users` u, `phpbb_posts_text` pt,
( SELECT u.user_id, e.member_id, e.member_name, e.member_gender, e.member_level, e.member_class_id, e.member_race_id
FROM `phpbb_users` u
LEFT JOIN eqdkp_members e ON u.user_eqdkpmem = e.member_id)j
WHERE p.topic_id = '3'
AND pt.post_id = p.post_id
AND u.user_id = p.poster_id
AND u.user_id = j.user_id

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But I don't know if this is the most efficient way, if any1 has any suggestions please let me know.