SELECT 
  p.product_id, 
  ifnull(
    count(dp.post_id), 
    0
  ) as discussion_amount_posts 
FROM 
  cscart_discussion 
  INNER JOIN cscart_products as p ON (
    cscart_discussion.object_id = p.product_id
  ) 
  INNER JOIN cscart_discussion_posts as dp ON (
    cscart_discussion.thread_id = dp.thread_id 
    AND cscart_discussion.object_type = 'P' 
    AND cscart_discussion.company_id = 1
  ) 
WHERE 
  dp.status = 'A' 
  and p.product_id in (
    73, 303, 339, 507, 508, 537, 1565, 1566, 
    1567, 1568, 1569, 1570, 5556, 5473, 
    5474, 504, 1843, 1841, 1855, 1840, 1853, 
    486, 1854, 1842
  ) 
GROUP BY 
  p.product_id