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 (
    21, 46, 48, 49, 50, 51, 53, 91, 92, 105, 
    129, 138, 139, 21567, 22712, 22713, 
    22714, 22715, 22716, 50989, 51081, 
    51082, 51083, 51085, 51086, 51087, 
    51088, 51089, 51090, 51091, 51092, 
    51093, 51095, 51096, 51097, 51098, 
    51099, 51100, 51101, 51102, 51103, 
    51105, 51121, 51122, 51123, 51125, 
    51126, 51127, 51128, 51129, 51152, 
    51153, 51154, 51155, 51156, 51157, 
    51158, 51159, 51160, 51172, 51173, 
    51174, 51176, 51296, 51297, 51298, 
    51299, 51300, 51301, 51302, 51303, 
    51304, 51305, 51306, 51307, 51308, 
    51309, 51316, 51317, 51318, 51319, 
    51320, 51321, 51322, 51323, 51324, 
    51370, 51371, 51372, 51373, 51443, 
    51452, 51453, 51496, 51497, 51498, 
    51564, 51565, 51566, 51567, 51568, 
    51569, 51570, 51571, 51572, 51573, 
    51574, 51575, 51576, 51577, 51578, 
    51579, 51580, 51581, 51582, 51583, 
    51584, 51585, 51586
  ) 
GROUP BY 
  p.product_id