Merge publication prevods to single page prevod

publication-merge.php

<?php
// First fetch all prevods
// Mysql call
$sql = "
SELECT ID, post_title, post_content, post_parent, post_name
FROM  wp_rscom_posts
WHERE post_parent
IN (
  SELECT ID
  FROM  wp_rscom_posts
  WHERE post_parent
  IN (
    SELECT ID
    FROM  `wp_rscom_posts`
    WHERE post_parent = 0
    AND post_type =  'prevod'
    AND post_status =  'publish'
  )
  AND post_type =  'prevod'
  AND post_status =  'publish'
  AND post_title NOT LIKE '%blog%'
)
AND post_type =  'prevod'
AND post_status =  'publish'
order by post_parent, ID"