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 (
    51020, 51027, 51067, 51423, 51435, 51431, 
    51031, 51062, 51028, 51441, 51434, 
    51033, 51432, 51026, 51042, 51030, 
    51032, 51425, 51070, 51035, 51059, 
    51066, 51041, 51038, 51023, 51039, 
    51056, 51069, 51040, 51050, 51065, 
    51036
  ) 
GROUP BY 
  p.product_id