DELETE wp_posts
FROM wp_posts
INNER JOIN wp_postmeta ON wp_postmeta.post_id = wp_posts.ID
WHERE (wp_postmeta.meta_key = 'InternalOnly' AND wp_postmeta.meta_value IS NOT NULL);
DELETE wp_posts
FROM wp_posts
INNER JOIN wp_postmeta ON wp_postmeta.post_id = wp_posts.ID
WHERE (wp_postmeta.meta_key = 'InternalOnly' AND wp_postmeta.meta_value IS NOT NULL);