Mysql 不存在元数据键的查询行

问题是一团糟。我只想查询所有没有特定元键的行。 上面，我查询所有具有meta键的行，然后将它们从外部查询中排除。 我不知道如何写得更好。

通过

左连接使用外部连接，并抓取未连接的行：

或：

您忘记在ON子句中包含
postETA.meta_key='z_latitude'
条件。请停止滥用其他人的答案，如果需要，您可以添加注释，但不要编辑他们的答案。
SELECT DISTINCT wposts.ID AS ID
FROM `wp_posts` AS wposts
JOIN `wp_postmeta` AS postmeta ON (wposts.ID = postmeta.post_id)
WHERE wposts.post_type = 'post'
AND wposts.ID NOT IN (
    SELECT wp_posts.ID FROM wp_posts, `wp_postmeta` AS postmeta2
    WHERE wp_posts.ID = postmeta2.post_id
    AND postmeta2.meta_key = 'z_latitude'
)
ORDER BY wposts.post_date DESC

SELECT DISTINCT wposts.ID AS ID
FROM `doxy_posts` AS wposts
left JOIN `doxy_postmeta` AS postmeta ON wposts.ID = postmeta.post_id
WHERE postmeta.post_id is null
ORDER BY wposts.post_date DESC

SELECT wposts.ID AS ID
FROM doxy_posts AS wposts
  LEFT JOIN doxy_postmeta AS postmeta
    ON wposts.ID = postmeta.post_id
    AND postmeta.meta_key = 'z_latitude'
WHERE wposts.post_type = 'post' 
  AND postmeta.post_id IS NULL
ORDER BY wposts.post_date DESC

SELECT wposts.ID AS ID
FROM doxy_posts AS wposts
WHERE wposts.post_type = 'post' 
  AND NOT EXISTS
        ( SELECT * 
          FROM doxy_postmeta AS postmeta
          WHERE wposts.ID = postmeta.post_id
            AND postmeta.meta_key = 'z_latitude'
        ) 
ORDER BY wposts.post_date DESC