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 (
    51480, 51479, 51494, 51495, 132, 112, 
    3, 78, 2, 77, 87, 66, 22421, 22424, 22290, 
    50981, 50982, 133, 45, 143, 50983, 51416, 
    51043, 51421, 51471, 51413, 51057, 
    51472, 51547, 51470, 51500, 51412, 
    51529, 51459, 51457, 51460, 51501, 
    51530, 51464, 51051, 51053, 51551, 
    51478, 51469, 51510, 51486, 51531, 
    51467, 51047, 51461, 51044, 51475, 
    51477, 51473, 51437, 51540, 51048, 
    51525, 51458, 51463, 51516, 51532, 
    51545, 51492, 51514, 51538, 51539, 
    51468, 51476, 51491, 51513, 51474, 
    51503, 51520, 51541, 51462, 51502, 
    51522, 51499, 51465, 51509, 51515, 
    51466, 51485, 51518, 51550, 51519, 
    51524, 51528, 51508, 51527, 51543, 
    51482, 51504, 51542, 51512, 51493, 
    51511, 51505, 51046, 51439, 51544, 
    51054, 51546, 51548, 51438, 51535
  ) 
GROUP BY 
  p.product_id