我有一个用于wordpress的mysql查询，可以获取高级自定义字段数据。如果其中一行没有结果，则整个查询不提供结果。我想知道我是否可以添加一些东西到查询中，如果没有and行的结果，它会忽略and行？

SELECT DISTINCT post_title,
wp0.post_id as the_post_id, 
wp1.meta_value as _sale_price,
wp2.meta_value as _regular_price,
wp3.meta_value as ex_diameter,
wp4.meta_value as ex_center,
wp5.meta_value as ex_length,
wp6.meta_value as ex_alloy,
wp7.meta_value as ex_butt_1,
wp8.meta_value as ex_butt_2,
wp9.meta_value as ex_taper_1,
wp10.meta_value as ex_taper_2,
wp11.meta_value as ex_center

from wp_postmeta as wp0
INNER JOIN wp_postmeta as wp1
ON wp1.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp2
ON wp2.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp3
ON wp3.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp4
ON wp4.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp5
ON wp5.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp6
ON wp6.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp7
ON wp7.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp8
ON wp8.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp9
ON wp9.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp10
ON wp10.post_id=wp0.post_id
INNER JOIN wp_postmeta as wp11
ON wp11.post_id=wp0.post_id

INNER JOIN wp_posts as wpp
ON wp1.post_id=wpp.ID
WHERE wp1.post_id='39' 
AND wp1.meta_key='_sale_price'
AND wp2.meta_key='_regular_price'
AND wp3.meta_key='ex_diameter'
AND wp4.meta_key='ex_center'
AND wp5.meta_key='ex_length'
AND wp6.meta_key='ex_alloy'
AND wp7.meta_key='ex_butt_1'
AND wp8.meta_key='ex_butt_2'
AND wp9.meta_key='ex_taper_1'
AND wp10.meta_key='ex_taper_2'
AND wp11.meta_key='ex_center'

例如；meta\u key='ex\u diameter'可能根本不存在，但整个结果不是使用空ex\u diameter获取结果，而是空的，不返回任何行。