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 (
    51165, 51164, 51163, 51162, 51161, 52, 
    51183, 20, 51188, 51187, 51186, 51185, 
    51184, 51194, 51193, 51192, 51191, 
    51190, 51189, 19, 51201, 51200, 51199, 
    51198, 51197, 51196, 51195, 131, 111, 
    51212, 144, 51215, 51214, 51213, 51444, 
    51445, 51446, 51447, 51231, 51230, 
    51229, 51228, 51227, 51226, 51225, 
    109, 51272, 51271, 51270, 51269, 51268, 
    51267, 51266, 145, 9, 59, 60, 14, 13, 
    127, 51325, 63, 50984, 51450, 51451, 
    51329, 51328, 51327, 50985, 51331, 
    51330, 50986, 51332, 51339, 51338, 
    51337, 51336, 50988, 113, 51346, 118, 
    51347, 85, 6, 61, 51350, 123, 15, 95, 
    136, 50992, 51374, 51375, 42, 51376, 
    51377, 51378, 51379, 51380, 50993, 
    51381, 51382, 134
  ) 
GROUP BY 
  p.product_id