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 (
    51272, 51271, 51270, 51269, 51268, 51267, 
    51266, 145, 60, 14, 127, 51325, 63, 50984, 
    51450, 51451, 51329, 51328, 51327, 
    50985, 51331, 51330, 50986, 51332, 
    51339, 51338, 51337, 51336, 50988, 
    113, 6, 136, 50992, 51374, 51375, 42, 
    51376, 51377, 51378, 51379, 51380, 
    50993, 51381, 51382, 134
  ) 
GROUP BY 
  p.product_id