wordpressのpostデータをカスタムポストを含めて、csvに出力する

最終的なsqlコマンドはこちら

SELECT p.ID, p.post_name, p.post_title,
custom_post_01.meta_value AS custom_post_01,
custom_post_02.meta_value AS custom_post_02,
custom_post_03.meta_value AS custom_post_03
FROM wp_posts AS p
LEFT JOIN wp_postmeta AS custom_post_01 ON p.ID = custom_post_01.post_id AND 'custom_post_01' = custom_post_01.meta_key
LEFT JOIN wp_postmeta AS custom_post_02 ON p.ID = custom_post_02.post_id AND 'custom_post_02' = custom_post_02.meta_key
LEFT JOIN wp_postmeta AS custom_post_03 ON p.ID = custom_post_03.post_id AND 'custom_post_03' = custom_post_03.meta_key
WHERE id IN (SELECT object_id from wp_term_relationships where term_taxonomy_id=1)
INTO OUTFILE '/tmp/wp_posts.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';

この辺を調べて対応できた。
http://qiita.com/yahsan2/items/5e342818075c7d0c34f8
http://qiita.com/yahsan2/items/77bae737934a95582fef
http://qiita.com/yahsan2/items/346c821cdd14cad0a704
http://qiita.com/yahsan2/items/3b06e801c7218ea0eefc