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 (
    21567, 51083, 22715, 51082, 51085, 51081, 
    51088, 51087, 22713, 51086, 51089, 
    51090, 51092, 51093, 22714, 51091, 
    51095, 51096, 51097, 51098, 51100, 
    51099, 22716, 51103, 22712, 51105, 
    51102, 51101, 51123, 51122, 51121, 
    92, 49, 51129, 51128, 51127, 51126, 
    51125, 48, 51155, 51154, 51153, 51152, 
    21, 51158, 51157, 51156, 53, 51160, 
    51159, 51176, 51174, 51173, 51172, 
    91, 105, 50989, 46, 51370, 51371, 51372, 
    51373, 51452, 51453, 51496
  ) 
GROUP BY 
  p.product_id