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, 
    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, 51220, 51219, 51218, 
    51217, 51216, 146, 51448, 51449, 51231, 
    51230, 51229, 51228, 51227, 51226, 
    51225, 109, 51272, 51271, 51270, 51269, 
    51268, 51267, 51266, 145, 9, 59, 13, 
    51346, 118, 51347, 85, 61, 15, 95
  ) 
GROUP BY 
  p.product_id