Combine 2 Queries with different number of rows - php

Question

I have a query that connects to a wordpress db and returns some posts.
In order to get the image for each of these posts i run another query inside a php foreach loop
The problem is that running the second query inside the foreach loop is extremely slow and i need another way to merge these 2 queries into 1.
The first query
SELECT pm. * , p.*
FROM wp_posts p
JOIN wp_postmeta pm ON pm.post_id = p.ID
WHERE pm.meta_key = 'accommodation_location_post_id'
AND pm.meta_value
IN (
SELECT pi.ID
FROM wp_posts pi
WHERE pi.post_title LIKE '%Cyprus%')
Based on the returned post ids, i need for each of these ids
the featured image.
This query does this job, but only for 1 id only.
The second query
SELECT wp_posts.guid
FROM wp_posts
WHERE wp_posts.ID =
(Select wp_postmeta.meta_value
FROM wp_postmeta
WHERE wp_postmeta.meta_key =
'_thumbnail_id' AND wp_postmeta.post_id = 'The id of each post')
I need a query to return all the posts alongside with its images.

Answer 1

I really don't understand your data structure, but try this query
select
t1.*, t2.guid
from (
SELECT pm. * , p.*
FROM wp_posts p
JOIN wp_postmeta pm ON pm.post_id = p.ID
WHERE pm.meta_key = 'accommodation_location_post_id'
AND pm.meta_value IN (
SELECT pi.ID
FROM wp_posts pi
WHERE pi.post_title LIKE '%Cyprus%'
)
) t1
left join (
select
p2.guid, pm2.post_id
from
wp_posts p2
join wp_postmeta pm2 on
pm2.meta_value = p2.ID
and pm2.meta_key = '_thumbnail_id'
) t2 on t2.post_id = t1.ID