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, 142, 62, 141, 27, 22, 23, 17, 18, 56, 
    126, 51295, 117, 116, 115, 81, 11, 51326, 
    135, 106, 105, 58, 57, 51344, 120, 51345, 
    119, 108, 4, 5, 107, 51348, 121, 51349, 
    122, 51496, 51497, 51498
  ) 
GROUP BY 
  p.product_id