我将问题中的链接重写为SQL
请记住，此脚本还将清除分配给页面的页面模板。

备份wp_postmeta 首先是表格。

DELETE pm 
FROM wp_postmeta pm LEFT JOIN wp_posts p ON pm.post_id = p.id
WHERE
    (p.post_type IN (\'post\', \'page\') AND pm.meta_key <> \'_thumbnail_id\')
    OR (p.post_type = \'attachment\' AND pm.meta_key <> \'_wp_attached_file\' 
        AND pm.meta_key <> \'_wp_attachment_metadata\')