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 (
    128, 51118, 51117, 51116, 51115, 51114, 
    51113, 51165, 51164, 51163, 51162, 
    51161, 52, 51183, 20, 51188, 51187, 
    51186, 51185, 51184, 51194, 51193, 
    51192, 51191, 51190, 51189, 19, 51220, 
    51219, 51218, 51217, 51216, 146, 51448, 
    51449, 51231, 51230, 51229, 51228, 
    51227, 51226, 51225, 109, 51243, 51242, 
    51241, 51240, 51239, 36, 51253, 51252, 
    51251, 51250, 51249, 34, 51273, 147, 
    51277, 51276, 51275, 51274, 16, 114, 
    84, 51352, 51351, 96, 89, 51390, 51391, 
    51392, 51393, 51394
  ) 
GROUP BY 
  p.product_id