drop temporary table if exists post_ids;
create temporary table if not exists post_ids
    select ID from wp_14_posts
    where post_status = 'publish'
    and post_type = 'post'
    and post_date < '2016-02-03 00:00:000';
delete wp_14_postmeta from wp_14_postmeta join post_ids
	on wp_14_postmeta.post_id = post_ids.ID
	and wp_14_postmeta.meta_key = 'featured-image-display';
insert into wp_14_postmeta (post_id, meta_key, meta_value)
  select ID, 'featured-image-display', false
  from post_ids;

/* to check your work
select * from wp_14_postmeta a
	right join post_ids b
	on a.post_id = b.ID
    and a.meta_key = 'featured-image-display';*/