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 (
    82, 51129, 51128, 51127, 51126, 51125, 
    48, 51139, 51138, 51137, 51136, 51135, 
    40, 51158, 51157, 51156, 53, 51160, 
    51159, 51176, 51174, 51173, 51172, 
    91, 51194, 51193, 51192, 51191, 51190, 
    51189, 19, 51246, 51245, 51244, 35, 
    51248, 51247, 17, 16, 54, 51313, 51312, 
    51314, 51311, 51310, 51323, 51322, 
    51321, 51320, 50, 51324, 105, 57, 51354, 
    51353, 43, 51361, 30, 51362, 51363, 
    51364, 51365
  ) 
GROUP BY 
  p.product_id