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 (
    295774, 303250, 308376, 316325, 317505, 
    319376, 325547, 325710, 325715, 322000, 
    6276, 19341, 119170, 142807, 162962, 
    164053, 180420, 220516, 238478, 242500, 
    263871, 295549, 295825, 317507
  ) 
GROUP BY 
  p.product_id